A304598 - OEIS

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A304598

Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 5 or 6 king-move adjacent elements, with upper left element zero.

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: A374825 A121452 A249165 * A171756 A235385 A144055

Adjacent sequences: A304595 A304596 A304597 * A304599 A304600 A304601

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 15 2018

STATUS

approved