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A268747
Number of nX5 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.
1
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
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 12 2016
STATUS
approved