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A304420 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 0
0, 7, 124, 9304, 1712347, 898146670, 1305482386171, 5296781617645719, 59891404546831242351 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304427.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304427.

Sequence in context: A074487 A192566 A322090 * A217910 A316276 A220615

Adjacent sequences:  A304417 A304418 A304419 * A304421 A304422 A304423

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 12 2018

STATUS

approved

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Last modified May 19 12:20 EDT 2022. Contains 353833 sequences. (Running on oeis4.)