A268747 Number of nX5 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

23, 244, 2615, 26334, 255651, 2425799, 22577073, 207252725, 1880654551, 16909709308, 150867667407, 1337324783132, 11788337576943, 103412756868981, 903363696442081, 7862056896605875, 68198486775427551, 589834799847933624

Offset

1,1

Comments

Column 5 of A268750.

Links

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

Formula

Empirical: a(n) = 8*a(n-1) +56*a(n-2) -288*a(n-3) -1506*a(n-4) +870*a(n-5) +7568*a(n-6) -1632*a(n-7) -15481*a(n-8) +4624*a(n-9) +13495*a(n-10) -6192*a(n-11) -4336*a(n-12) +2890*a(n-13) +82*a(n-14) -288*a(n-15) +24*a(n-16) +8*a(n-17) -a(n-18)

Example

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

Crossrefs

Cf. A268750.

Sequence in context: A362431 A087332 A159998 * A158970 A161472 A242279

Adjacent sequences: A268744 A268745 A268746 * A268748 A268749 A268750

Keyword

nonn

Author

R. H. Hardin, Feb 12 2016

Status

approved