A303176 - OEIS

A303176

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

1, 8, 31, 297, 5613, 218980, 11901719, 1341217380, 375045359077, 204902495620748, 208094348433251495

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OFFSET

1,2

COMMENTS

Diagonal of A303182.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303182.

Sequence in context: A121093 A296830 A232621 * A209484 A209343 A270523

Adjacent sequences: A303173 A303174 A303175 * A303177 A303178 A303179

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 19 2018

STATUS

approved