A302684 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

32, 14, 18, 64, 125, 453, 2013, 6725, 21745, 80985, 295335, 1015113, 3570091, 12835677, 45416833, 159687591, 566457119, 2010993911, 7108904181, 25146289499, 89111146015, 315554058131, 1116679458873, 3953641136991, 14000618548225

Offset: 1

Author

R. H. Hardin, Apr 11 2018

Keywords

• nonn

Comments

Row 6 of A302680.

Examples

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

Links

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

Crossrefs

Cf. A302680.

Formula

Empirical: a(n) = a(n-1) +2*a(n-2) +18*a(n-3) +31*a(n-4) -4*a(n-5) -56*a(n-6) -58*a(n-7) -38*a(n-8) +52*a(n-9) +7*a(n-10) -47*a(n-11) +10*a(n-12) +a(n-13) -32*a(n-14) +12*a(n-15) +2*a(n-16) +8*a(n-17) for n>23