A222610 - OEIS

A222610

Number of nX2 0..3 arrays with no more than floor(nX2/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order

1, 1, 3, 12, 40, 149, 615, 2659, 11641, 51672, 231598, 1044550, 4729221, 21473854, 97727797, 445587611, 2034814173, 9304775285, 42600153350, 195249156987, 895771869115, 4113392176083, 18904548916567, 86949854091897

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OFFSET

1,3

COMMENTS

Column 2 of A222616

LINKS

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

EXAMPLE

All solutions for n=3

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

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

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