A300532 Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 12, 300, 12951, 1972991, 831752031, 946782030618, 2954430191005674, 25119015182967409981

Offset

1,2

Comments

Diagonal of A300539.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A300539.

Sequence in context: A280086 A369186 A102945 * A249940 A132515 A279122

Adjacent sequences: A300529 A300530 A300531 * A300533 A300534 A300535

Keyword

nonn

Author

R. H. Hardin, Mar 08 2018

Status

approved