A302814 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 75, 1494, 57684, 5520999, 1135257814, 402121386052, 303834035008015

Offset

1,2

Comments

Diagonal of A302820.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A302820.

Sequence in context: A071720 A273998 A111685 * A088376 A096293 A355049

Adjacent sequences: A302811 A302812 A302813 * A302815 A302816 A302817

Keyword

nonn

Author

R. H. Hardin, Apr 13 2018

Status

approved