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A268975
Number of 5Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.
1
243, 8448, 114048, 1504656, 18852912, 231730344, 2799406656, 33382885464, 393837138576, 4605236160408, 53449814746368, 616434849399384, 7070720929863408, 80721453100802904, 917737124914636128
OFFSET
1,1
COMMENTS
Row 5 of A268971.
LINKS
FORMULA
Empirical: a(n) = 32*a(n-1) -384*a(n-2) +2200*a(n-3) -6494*a(n-4) +9016*a(n-5) -816*a(n-6) -14888*a(n-7) +18879*a(n-8) -5464*a(n-9) -7472*a(n-10) +8336*a(n-11) -3648*a(n-12) +768*a(n-13) -64*a(n-14) for n>18
EXAMPLE
Some solutions for n=3
..1..0..1. .0..2..2. .2..1..2. .0..0..0. .2..1..2. .0..1..2. .0..1..0
..1..2..1. .1..2..1. .0..1..0. .1..0..0. .0..1..0. .0..1..0. .0..0..1
..2..2..2. .1..0..0. .0..1..2. .0..0..0. .2..1..2. .0..0..1. .2..2..2
..1..2..2. .0..0..0. .0..1..2. .1..0..1. .2..2..1. .0..1..0. .1..2..1
..1..1..2. .0..1..0. .2..1..1. .1..0..2. .1..0..0. .0..0..0. .1..2..2
CROSSREFS
Cf. A268971.
Sequence in context: A016769 A224015 A059860 * A223207 A224313 A224377
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 16 2016
STATUS
approved