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

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

Crossrefs

Sequence in context: A028858 A058106 A021103 * A209977 A001902 A224085

Adjacent sequences: A222659 A222660 A222661 * A222663 A222664 A222665

Keyword

nonn

Author

R. H. Hardin Feb 28 2013

Status

approved