The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A217720

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A217720

Number of one-sided polydrafters with n cells.
(history; published version)

#20 by Peter Luschny at Sat May 14 04:55:19 EDT 2022

STATUS

reviewed

approved

#19 by Joerg Arndt at Sat May 14 02:08:57 EDT 2022

STATUS

proposed

reviewed

#18 by Aaron N. Siegel at Fri May 13 19:19:04 EDT 2022

STATUS

editing

proposed

Discussion

Sat May 14

02:08

Joerg Arndt: Are the "certain restrictions" in the first comment that the assembly must be edge-to-edge and adjacent edges flush?

#17 by Aaron N. Siegel at Fri May 13 19:17:33 EDT 2022

DATA

2, 8, 28, 116, 474, 2001, 8508, 37162, 163730, 729683, 3269602, 14773831

EXTENSIONS

a(8)-a(12) from Aaron N. Siegel, May 13 2022

STATUS

approved

editing

#16 by T. D. Noe at Mon Mar 25 11:54:47 EDT 2013

STATUS

editing

approved

#15 by T. D. Noe at Mon Mar 25 11:54:33 EDT 2013

CROSSREFS

Cf. A056842, (number of (two-sided) polydrafters).

EXTENSIONS

Added a(7). Added a comment about odd-numbered entries. Deleted an obtrusive <br> tag.

STATUS

approved

editing

#14 by T. D. Noe at Mon Mar 25 11:53:45 EDT 2013

STATUS

proposed

approved

#13 by George Sicherman at Fri Mar 22 10:19:32 EDT 2013

STATUS

editing

proposed

#12 by George Sicherman at Fri Mar 22 10:18:37 EDT 2013

DATA

2, 8, 28, 116, 474, 2001, 8508

COMMENTS

For odd n, an n-drafter cannot have mirror symmetry, so odd entries in this sequence are double those in A056842.

LINKS

K. Ishino, <a href="http://puzzlewillbeplayed.com/Polydrafters/">Polydrafters</a><br>

EXTENSIONS

Added a(7). Added a comment about odd-numbered entries. Deleted an obtrusive <br> tag.

STATUS

approved

editing

#11 by Bruno Berselli at Fri Mar 22 09:59:15 EDT 2013

STATUS

editing

approved