A235408 - OEIS

A235408

Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise

121, 704, 4256, 20398, 98575, 397340, 1623115, 5744912, 20612708, 65877470, 213190201, 627225413, 1867007833, 5131067959, 14261504547, 37041121138, 97280493869, 241057367009, 603912355679, 1438964930953, 3465601783227

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 3 of A235413

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 73

FORMULA

Empirical recurrence of order 73 (see link above)

EXAMPLE

Some solutions for n=4

..1..0..0..0....0..1..0..1....0..1..0..1....1..0..0..1....1..0..0..0

..0..1..0..0....1..0..1..0....1..1..0..1....1..1..1..0....0..0..0..0

..1..0..1..0....1..1..0..1....0..1..1..0....1..0..1..1....0..1..0..1

..0..1..0..0....1..0..1..0....1..1..0..1....1..1..1..0....1..0..1..0

..1..1..1..0....1..1..1..0....1..1..1..1....0..1..1..0....0..1..0..1

CROSSREFS

Sequence in context: A329705 A020229 A141350 * A361703 A190877 A361636

Adjacent sequences: A235405 A235406 A235407 * A235409 A235410 A235411

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2014

STATUS

approved