

A232918


Number of nX6 0..2 arrays with no element x(i,j) adjacent to value 2x(i,j) horizontally, diagonally or antidiagonally


1



96, 1080, 13992, 186720, 2515716, 33994188, 459797904, 6221092260, 84180552504, 1139126465856, 15414771639624, 208595002222596, 2822742415594800, 38197837835124312, 516899809502860032, 6994778773839006000
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OFFSET

1,1


COMMENTS

Column 6 of A232920


LINKS

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


FORMULA

Empirical: a(n) = 18*a(n1) 56*a(n2) 81*a(n3) +280*a(n4) +12*a(n5) 259*a(n6) +78*a(n7) +24*a(n8) 5*a(n9)


EXAMPLE

Some solutions for n=3
..1..2..2..1..2..1....2..2..1..2..1..0....0..0..0..0..0..1....2..1..0..1..0..1
..2..2..2..2..2..2....2..2..1..2..1..2....0..0..0..1..0..0....0..1..2..1..2..1
..2..2..1..2..2..1....2..2..1..0..1..2....1..0..0..0..0..0....2..1..2..2..2..1


CROSSREFS

Sequence in context: A202583 A027628 A182684 * A187165 A229533 A282017
Adjacent sequences: A232915 A232916 A232917 * A232919 A232920 A232921


KEYWORD

nonn


AUTHOR

R. H. Hardin, Dec 02 2013


STATUS

approved



