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A302629 Number of nXn 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 0
1, 3, 8, 33, 257, 2262, 30216, 652931, 18446157, 797627174, 48788464441, 4420985966927, 579498900792438, 110425750437014304, 30435339544089493297 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A302635.

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302635.

Sequence in context: A109655 A184255 A001120 * A322303 A117722 A231856

Adjacent sequences:  A302626 A302627 A302628 * A302630 A302631 A302632

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 10 2018

STATUS

approved

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Last modified October 22 13:35 EDT 2019. Contains 328318 sequences. (Running on oeis4.)