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A298623 Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 0
0, 1, 8, 125, 20959, 7087666, 9557110072, 42384213387355, 621075964119527775 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A298629.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298629.

Sequence in context: A273279 A227851 A076960 * A035130 A055762 A281714

Adjacent sequences:  A298620 A298621 A298622 * A298624 A298625 A298626

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 23 2018

STATUS

approved

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Last modified January 29 05:09 EST 2022. Contains 350672 sequences. (Running on oeis4.)