A301324 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 7, 45, 664, 17491, 1127238, 135428462, 34057380439, 17040140705965

Offset

1,2

Comments

Diagonal of A301330.

Links

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

Example

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

Crossrefs

Cf. A301330.

Sequence in context: A041016 A351354 A365572 * A184339 A294915 A003758

Adjacent sequences: A301321 A301322 A301323 * A301325 A301326 A301327

Keyword

nonn

Author

R. H. Hardin, Mar 18 2018

Status

approved