A202977 Number of nX6 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors

1, 31, 866, 17740, 379788, 8071997, 170937904, 3635245483, 77355342983, 1645059084851, 34980781489450, 743874666203318, 15818866015610506, 336395670890580933, 7153607521601342149, 152124673570902721461

Offset

1,2

Comments

Column 6 of A202979

Links

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

Example

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

Crossrefs

Sequence in context: A006111 A183828 A180847 * A213467 A157878 A162835

Adjacent sequences: A202974 A202975 A202976 * A202978 A202979 A202980

Keyword

nonn

Author

R. H. Hardin Dec 26 2011

Status

approved