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A304895 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero. 0
0, 7, 62, 2373, 107723, 11067544, 2256313057, 816589152784, 612719659755750 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304901.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304901.

Sequence in context: A055066 A216534 A167550 * A161201 A007291 A343137

Adjacent sequences:  A304892 A304893 A304894 * A304896 A304897 A304898

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 20 2018

STATUS

approved

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Last modified June 14 15:36 EDT 2021. Contains 345025 sequences. (Running on oeis4.)