A306160 - OEIS

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A306160

Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 4, 17, 103, 1188, 25226, 842280, 47632142, 4469582265, 707797981908, 187189348152519, 82725002911322885

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A306166.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A306166.

Sequence in context: A128321 A290352 A091635 * A127676 A335626 A232211

Adjacent sequences: A306157 A306158 A306159 * A306161 A306162 A306163

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 23 2018

STATUS

approved