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A303248 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
0, 3, 49, 1401, 106803, 19457754, 7600681910, 7516309079483, 16637614325062889 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303254.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303254.

Sequence in context: A277497 A173174 A302466 * A187664 A336673 A012199

Adjacent sequences:  A303245 A303246 A303247 * A303249 A303250 A303251

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 20 2018

STATUS

approved

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)