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A302409 Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
1, 8, 30, 259, 3553, 84581, 2342685, 119713006, 12137387233, 2207029867972, 643385844203031, 329004378370081339 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302415.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302415.

Sequence in context: A221145 A098741 A027146 * A226968 A303679 A304218

Adjacent sequences:  A302406 A302407 A302408 * A302410 A302411 A302412

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 07 2018

STATUS

approved

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Last modified June 26 10:53 EDT 2022. Contains 354881 sequences. (Running on oeis4.)