A222643 Number of nX2 0..2 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..2 order

1, 1, 3, 12, 38, 124, 430, 1530, 5378, 18938, 67042, 238446, 849586, 3033214, 10851386, 38895414, 139634834, 502003486, 1807104810, 6512929766, 23498319154, 84864219966, 306764487338, 1109807490550, 4018136484386, 14558333191406

Offset

1,3

Comments

Column 2 of A222649

Links

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

Example

All solutions for n=3
..0..0....0..0....0..1
..0..0....0..0....1..1
..0..1....0..0....1..1

Crossrefs

Sequence in context: A217093 A278639 A350787 * A129014 A335412 A332376

Adjacent sequences: A222640 A222641 A222642 * A222644 A222645 A222646

Keyword

nonn

Author

R. H. Hardin Feb 27 2013

Status

approved