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A316926 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 0
1, 4, 25, 1719, 467377, 504420842, 2110655397816, 33990477458950173, 2097232699194056398870 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A316932.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A316932.

Sequence in context: A305679 A317061 A144229 * A317699 A284106 A063802

Adjacent sequences:  A316923 A316924 A316925 * A316927 A316928 A316929

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 16 2018

STATUS

approved

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Last modified May 23 20:23 EDT 2019. Contains 323528 sequences. (Running on oeis4.)