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A304545 Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero. 0
1, 4, 13, 418, 16782, 1368963, 274090332, 104360036860, 78307988484284 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304551.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304551.

Sequence in context: A219822 A048558 A219571 * A316372 A306130 A317267

Adjacent sequences:  A304542 A304543 A304544 * A304546 A304547 A304548

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 14 2018

STATUS

approved

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Last modified May 22 10:56 EDT 2022. Contains 353949 sequences. (Running on oeis4.)