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A304303 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero. 0
1, 8, 77, 1137, 26548, 989406, 55773947, 4882896349, 654105710575 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304310.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304310.

Sequence in context: A187638 A092661 A196071 * A074841 A272208 A136954

Adjacent sequences:  A304300 A304301 A304302 * A304304 A304305 A304306

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 10 2018

STATUS

approved

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Last modified April 21 22:12 EDT 2019. Contains 322328 sequences. (Running on oeis4.)