A302802 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 169, 8718, 1089773, 327603711, 238687785290, 420681832487223, 1791195821074091291

Offset

1,2

Comments

Diagonal of A302808.

Links

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

Example

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

Crossrefs

Cf. A302808.

Sequence in context: A139564 A264113 A181198 * A316816 A001534 A096486

Adjacent sequences: A302799 A302800 A302801 * A302803 A302804 A302805

Keyword

nonn

Author

R. H. Hardin, Apr 13 2018

Status

approved