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A299683 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 0
1, 4, 15, 648, 23116, 5740433, 4582634341, 9172624830461, 66764212816377961 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A299689.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A299689.

Sequence in context: A000881 A109923 A006524 * A295231 A070037 A297859

Adjacent sequences:  A299680 A299681 A299682 * A299684 A299685 A299686

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 16 2018

STATUS

approved

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Last modified December 3 19:30 EST 2020. Contains 338917 sequences. (Running on oeis4.)