A303806 Number of nX6 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.

13, 61, 47, 107, 174, 316, 597, 1298, 2799, 6188, 13927, 32115, 74576, 176347, 420893, 1007545, 2418100, 5845990, 14209105, 34637540, 84594326, 207132363, 508170970, 1248839455, 3073699411, 7576337965, 18694693560, 46170243550, 114117748186

Offset

1,1

Comments

Column 6 of A303808.

Links

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

Example

Some solutions for n=5
..0..0..0..0..0..0. .0..1..1..1..1..0. .0..0..0..0..0..1. .0..0..1..1..1..1
..0..0..0..0..0..0. .1..1..1..1..0..0. .0..0..0..0..0..0. .0..1..1..1..1..1
..0..0..0..0..0..0. .1..1..1..0..0..0. .1..0..0..0..0..0. .1..1..1..1..1..1
..1..0..0..0..0..0. .1..1..0..0..0..0. .1..1..0..0..0..0. .1..1..1..1..1..0
..1..1..0..0..0..0. .1..0..0..0..0..0. .1..1..1..0..0..1. .0..1..1..1..0..0

Crossrefs

Cf. A303808.

Sequence in context: A295915 A219925 A228282 * A304853 A343538 A305250

Adjacent sequences: A303803 A303804 A303805 * A303807 A303808 A303809

Keyword

nonn

Author

R. H. Hardin, Apr 30 2018

Status

approved