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A222662

Number of nX4 0..3 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

3, 9, 44, 452, 4241, 62406, 1058776, 17374571, 288771291, 4860565711, 81668904553, 1371394427050, 23054727857828, 387744337542770, 6522573483253608, 109759232573531088, 1847613631016545713, 31110964472846965874

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 4 of A222666

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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