A204481 - OEIS

A204481

Number of (n+2)X8 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order

24718, 29959, 9290, 11364, 11338, 18410, 47369, 133889, 481694, 1808046, 6765672, 25621498, 97131639, 368034455, 1395284106, 5289949408, 20055106670, 76034602906, 288269180957, 1092909631093, 4143534785206, 15709333424602

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OFFSET

1,1

COMMENTS

Column 6 of A204483

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +a(n-2) -2*a(n-3) -19*a(n-4) -4*a(n-5) +21*a(n-6) +24*a(n-7) +3*a(n-8) -18*a(n-9) -9*a(n-10) for n>13

EXAMPLE

Some solutions for n=3

..0..0..1..1..2..1..1..3....0..1..1..0..1..0..2..1....0..1..0..0..2..2..1..1