The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A001465

(Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A001465

Number of degree-n odd permutations of order 2.
(history; published version)

#55 by Peter Luschny at Sat Oct 24 04:28:10 EDT 2020

STATUS

reviewed

approved

#54 by Joerg Arndt at Sat Oct 24 03:07:19 EDT 2020

STATUS

proposed

reviewed

#53 by Joerg Arndt at Sat Oct 24 03:07:07 EDT 2020

STATUS

editing

proposed

Discussion

Sat Oct 24

03:07

Joerg Arndt: Yes, done.

#52 by Joerg Arndt at Sat Oct 24 03:07:04 EDT 2020

FORMULA

a(n) = Sum_{i=0..floor((n-2)/4)} binomial(n,4i+2)*(4i+2)!/(2^(2i+1)*(2i+1)!). - Luis Manuel Rivera Martínez, May 22 2018 [The same as Ralf Stephan's formula above.]

STATUS

proposed

editing

#51 by Peter Luschny at Sat Oct 24 02:51:03 EDT 2020

STATUS

editing

proposed

#50 by Peter Luschny at Sat Oct 24 02:49:54 EDT 2020

FORMULA

a(n) = Sum_{i=0..floor((n-2)/4)} binomial(n,4i+2)*(4i+2)!/(2^(2i+1)*(2i+1)!). - Luis Manuel Rivera Martínez, May 22 2018 [The same as _Ralf Stephan_'s formula above.]

STATUS

reviewed

editing

Discussion

Sat Oct 24

02:50

Peter Luschny: In my opinion Martinez's formula should be deleted.

#49 by Joerg Arndt at Sat Oct 24 02:29:20 EDT 2020

STATUS

proposed

reviewed

#48 by Michel Marcus at Sat Oct 24 02:09:32 EDT 2020

STATUS

editing

proposed

#47 by Michel Marcus at Sat Oct 24 02:09:29 EDT 2020

FORMULA

a(n) = Sum_{i=0..floor((n-2)/4)} binomial(n,4i+2)*(4i+2)!/(2^(2i+1)*(2i+1)!). - Luis Manuel Rivera Martínez, May 22 2018

STATUS

reviewed

editing

#46 by Michel Marcus at Sat Oct 24 02:08:05 EDT 2020

STATUS

proposed

reviewed