A301444 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 8, 171, 9541, 1423344, 564002959, 592006690060, 1646995545166039, 12145346382857661327, 237428255410557186948107

Offset

1,2

Comments

Diagonal of A301450.

Links

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

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
..1..1..1..1..0. .0..1..1..1..0. .1..0..1..0..0. .1..1..0..0..0
..0..0..0..1..1. .0..0..1..1..1. .0..1..0..1..1. .0..1..1..1..1
..1..0..0..1..1. .0..1..1..1..0. .1..0..1..0..1. .1..0..1..0..1
..0..0..1..1..0. .0..0..1..1..0. .1..0..0..0..1. .0..0..0..0..1

Crossrefs

Cf. A301450.

Sequence in context: A303463 A300805 A317566 * A333036 A247729 A333460

Adjacent sequences: A301441 A301442 A301443 * A301445 A301446 A301447

Keyword

nonn

Author

R. H. Hardin, Mar 21 2018

Status

approved