A302727 Number of nX7 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

8, 98, 363, 1723, 16265, 89121, 532511, 4281120, 26823700, 176193198, 1287161045, 8543705276, 58177418523, 410055506135, 2784959794292, 19190983835759, 133544369858762, 915736969076289, 6331727880485698, 43862835910755482

Offset

1,1

Comments

Column 7 of A302728.

Links

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

Example

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

Crossrefs

Cf. A302728.

Sequence in context: A292747 A083182 A302277 * A116267 A183334 A196327

Adjacent sequences: A302724 A302725 A302726 * A302728 A302729 A302730

Keyword

nonn

Author

R. H. Hardin, Apr 12 2018

Status

approved