A301485 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 7, 52, 599, 15124, 903707, 116648010, 34593556316, 23228787136780, 34303673074888666

Offset

1,2

Comments

Diagonal of A301491.

Links

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

Example

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

Crossrefs

Cf. A301491.

Sequence in context: A179517 A300932 A300875 * A357362 A224501 A241487

Adjacent sequences: A301482 A301483 A301484 * A301486 A301487 A301488

Keyword

nonn

Author

R. H. Hardin, Mar 22 2018

Status

approved