A300640 Number of n X n 0..1 arrays with every element equal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 2, 64, 2998, 456649, 209156119, 280782187131, 1114340919987573, 12994612967873847001, 446094799302794492462850

Offset

1,3

Comments

Diagonal of A300646.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A300646.

Sequence in context: A013822 A010047 A187548 * A054956 A210930 A263185

Adjacent sequences: A300637 A300638 A300639 * A300641 A300642 A300643

Keyword

nonn

Author

R. H. Hardin, Mar 10 2018

Status

approved