A297731 Number of nX6 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 4 neighboring 1s.

1, 61, 223, 1103, 11341, 65215, 414651, 3199929, 21221319, 144970307, 1047053494, 7264521347, 50855971280, 362028443523, 2549685989975, 18010279437728, 127888224042540, 905521633348229, 6418498452393980, 45573582767848687

Offset

1,2

Comments

Column 6 of A297733.

Links

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

Example

Some solutions for n=6
..0..0..0..0..0..0. .0..1..1..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..0
..0..1..1..0..1..0. .1..1..0..0..1..0. .0..0..0..0..1..0. .0..0..1..1..1..0
..0..0..1..1..0..1. .0..0..0..1..1..1. .0..0..0..1..0..1. .0..0..0..1..0..0
..0..0..0..0..1..1. .0..0..0..0..0..0. .0..0..0..1..1..0. .0..1..1..1..1..0
..1..1..0..0..1..1. .1..1..1..1..0..0. .1..1..1..1..0..0. .0..1..1..0..1..0
..1..1..0..0..0..0. .0..1..0..1..1..0. .0..1..0..0..0..0. .0..0..0..1..0..0

Crossrefs

Cf. A297733.

Sequence in context: A171585 A038643 A273364 * A228130 A142267 A034863

Adjacent sequences: A297728 A297729 A297730 * A297732 A297733 A297734

Keyword

nonn

Author

R. H. Hardin, Jan 04 2018

Status

approved