

A305335


Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5 or 8 kingmove adjacent elements, with upper left element zero.


1



4, 5, 12, 26, 62, 166, 431, 1091, 2812, 7268, 18741, 48294, 124560, 321313, 828693, 2137285, 5512541, 14218105, 36671374, 94583059, 243949927, 629198761, 1622836684, 4185639740, 10795653340, 27844280385, 71816305058, 185229485865
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OFFSET

1,1


COMMENTS



LINKS



FORMULA

Empirical: a(n) = a(n1) +3*a(n2) +3*a(n3) +2*a(n4) 3*a(n5) 8*a(n6) 4*a(n7) for n>8


EXAMPLE

Some solutions for n=5
..0..0..0. .0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..1..0. .0..0..0
..0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0. .0..0..0
..0..1..0. .1..0..0. .1..0..0. .0..0..1. .0..0..0. .0..0..0. .1..0..0
..0..0..0. .0..0..0. .0..0..1. .0..0..0. .0..0..0. .0..0..0. .0..0..0
..0..0..0. .0..1..0. .0..0..0. .0..1..0. .0..0..0. .0..1..0. .0..1..0


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



