A300925 - OEIS

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A300925

Number of nX3 0..1 arrays with every element equal to 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 11, 75, 508, 3447, 23404, 158855, 1078231, 7318522, 49674630, 337167639, 2288532749, 15533466237, 105433742828, 715633842274, 4857380402810, 32969576037134, 223781720583309, 1518923337407277, 10309725472244584

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OFFSET

1,2

COMMENTS

Column 3 of A300930.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) +6*a(n-2) -3*a(n-3) -9*a(n-4) -6*a(n-5) +3*a(n-6) +6*a(n-7) +2*a(n-8) for n>10

EXAMPLE

Some solutions for n=5

..0..0..0. .0..0..0. .0..0..1. .0..0..0. .0..1..1. .0..0..1. .0..1..1