A303415 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

1, 8, 252, 30897, 14783632, 27575294129, 200493397340704, 5683010875200460450, 627998579658329070097348, 270542136528524318473547313146, 454367389836320183421616246521390670

Offset

1,2

Comments

Diagonal of A303421.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Cf. A303421.

Sequence in context: A347107 A138323 A214817 * A301401 A162132 A297051

Adjacent sequences: A303412 A303413 A303414 * A303416 A303417 A303418

Keyword

nonn

Author

R. H. Hardin, Apr 23 2018

Status

approved