A297393 Number of nX6 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

9, 69, 323, 2569, 14940, 99682, 640562, 4101278, 26607999, 170810312, 1102871801, 7104859427, 45791052572, 295185451556, 1902301744507, 12261796238309, 79028574384941, 509365351856610, 3283017190154762, 21159928491044181

Offset: 1

Author

R. H. Hardin, Dec 29 2017

Keywords

• nonn

Comments

Column 6 of A297395.

Examples

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

Links

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

Crossrefs

Cf. A297395.

Formula

Empirical: a(n) = 2*a(n-1) +16*a(n-2) +55*a(n-3) +143*a(n-4) +377*a(n-5) -1022*a(n-6) -1350*a(n-7) -647*a(n-8) -3863*a(n-9) -4798*a(n-10) -4588*a(n-11) +36964*a(n-12) +21604*a(n-13) +14553*a(n-14) +107577*a(n-15) +51945*a(n-16) -52831*a(n-17) -345125*a(n-18) -312451*a(n-19) -218764*a(n-20) -24650*a(n-21) +55508*a(n-22) +98904*a(n-23) +3168*a(n-24) -16128*a(n-25)