A208389 - OEIS

A208389

Number of n X 5 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors.

41, 8838, 1937736, 424785708, 93120350760, 20413586117376, 4475009970818208, 980999326809336384, 215051963118734640384, 47143097428659169764096, 10334579619442851721032192, 2265518002338040963538165760

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OFFSET

1,1

COMMENTS

Column 5 of A208392.

LINKS

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

FORMULA

Empirical: a(n) = 222*a(n-1) - 612*a(n-2) + 432*a(n-3) for n>4.

Empirical g.f.: x*(41 - 264*x + 792*x^2 - 540*x^3) / (1 - 222*x + 612*x^2 - 432*x^3). - Colin Barker, Jul 02 2018

EXAMPLE

Some solutions for n=4: