A301492 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 5, 83, 2803, 268802, 62812639, 39447933621, 63780972381537, 267328043698021585

Offset

1,2

Comments

Diagonal of A301498.

Links

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

Example

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

Crossrefs

Cf. A301498.

Sequence in context: A323490 A368015 A144617 * A107655 A182234 A308612

Adjacent sequences: A301489 A301490 A301491 * A301493 A301494 A301495

Keyword

nonn

Author

R. H. Hardin, Mar 22 2018

Status

approved