A268975 Number of 5Xn 0..2 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling two not more than once.

243, 8448, 114048, 1504656, 18852912, 231730344, 2799406656, 33382885464, 393837138576, 4605236160408, 53449814746368, 616434849399384, 7070720929863408, 80721453100802904, 917737124914636128

Offset

1,1

Comments

Row 5 of A268971.

Links

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

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

Adjacent sequences: A268972 A268973 A268974 * A268976 A268977 A268978

Keyword

nonn

Author

R. H. Hardin, Feb 16 2016

Status

approved