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A222675

Number of nX4 0..3 arrays with no more than floor(nX4/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

4, 10, 58, 527, 8276, 133028, 2363628, 40206464, 727306856, 12525102179, 225526086320, 3916711645116, 70238669794180, 1227292294581568, 21942415435228510, 385251466640023275, 6872913615981792520

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OFFSET

1,1

COMMENTS

Column 4 of A222679

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..87

EXAMPLE

Some solutions for n=3

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

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

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