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A304598 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 5 or 6 king-move adjacent elements, with upper left element zero. 0
1, 4, 13, 73, 560, 6007, 75463, 1874284, 62934491, 2085910493, 94776909801, 7409071360844, 887762245576310 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304604.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304604.

Sequence in context: A197969 A121452 A249165 * A171756 A235385 A144055

Adjacent sequences:  A304595 A304596 A304597 * A304599 A304600 A304601

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 15 2018

STATUS

approved

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Last modified June 6 15:48 EDT 2020. Contains 334828 sequences. (Running on oeis4.)