A300633 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 2, 13, 97, 1130, 23097, 865205, 57365508, 7042663221, 1472367608349

Offset

1,2

Comments

Diagonal of A300639.

Links

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

Example

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

Crossrefs

Cf. A300639.

Sequence in context: A320360 A074614 A184019 * A340451 A064325 A365155

Adjacent sequences: A300630 A300631 A300632 * A300634 A300635 A300636

Keyword

nonn

Author

R. H. Hardin, Mar 10 2018

Status

approved