A201352 Number of nX7 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor

6, 54, 585, 9111, 164704, 3030673, 53350918, 867792264, 12855063828, 173064550218, 2125820442965, 23973988256341, 249906703874274, 2423485396921085, 21992456168363649, 187733722448990317

Offset

1,1

Comments

Column 7 of A201353

Links

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

Formula

Empirical: a(n) is a polynomial of degree 127 for n>46

Example

Some solutions for n=4
..0..0..0..1..1..1..1....0..0..0..1..1..1..1....0..0..0..0..1..1..1
..1..1..1..0..0..0..0....0..1..1..0..1..1..1....0..1..1..1..0..0..0
..1..1..1..0..0..0..1....1..0..0..0..1..1..1....1..1..1..1..0..0..0
..1..1..1..0..0..0..1....1..1..1..0..0..0..1....1..1..1..1..0..1..1

Crossrefs

Sequence in context: A365843 A366014 A241843 * A186375 A231554 A069726

Adjacent sequences: A201349 A201350 A201351 * A201353 A201354 A201355

Keyword

nonn

Author

R. H. Hardin Nov 30 2011

Status

approved