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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
1, 8, 252, 30897, 14783632, 27575294129, 200493397340704, 5683010875200460450, 627998579658329070097348, 270542136528524318473547313146, 454367389836320183421616246521390670 (list; graph; refs; listen; history; text; internal format)
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: A300202 A138323 A214817 * A301401 A162132 A297051

Adjacent sequences:  A303412 A303413 A303414 * A303416 A303417 A303418

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 23 2018

STATUS

approved

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Last modified September 18 19:15 EDT 2021. Contains 347534 sequences. (Running on oeis4.)