A302617 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 25, 130, 896, 9015, 159831, 5004858, 294788397, 30176400734, 5405230985847, 1752290111920178, 1004963193258165778, 1008871420120253493228, 1799713610080002182624711

Offset

1,2

Comments

Diagonal of A302623.

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=5
..0..1..1..0..1. .0..0..1..0..0. .0..0..1..0..1. .0..1..1..1..0
..0..1..0..0..1. .1..1..0..1..1. .1..0..0..0..1. .0..0..1..0..0
..0..1..0..1..1. .0..1..0..1..0. .1..0..1..0..1. .1..0..1..0..1
..1..1..0..1..0. .1..1..0..1..0. .0..0..1..0..1. .1..1..1..1..1
..1..0..0..1..1. .1..0..0..1..1. .1..1..0..1..0. .1..0..1..0..1

Crossrefs

Cf. A302623.

Sequence in context: A069586 A253237 A275151 * A042189 A305680 A316927

Adjacent sequences: A302614 A302615 A302616 * A302618 A302619 A302620

Keyword

nonn

Author

R. H. Hardin, Apr 10 2018

Status

approved