A298721 - OEIS

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A298721

Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 5 or 8 king-move adjacent elements, with upper left element zero.

1, 5, 5, 34, 336, 4001, 76983, 2232433, 92349689, 5607760208

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

OFFSET

1,2

COMMENTS

Diagonal of A298727.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298727.

Sequence in context: A270725 A317812 A298961 * A299555 A160608 A208950

Adjacent sequences: A298718 A298719 A298720 * A298722 A298723 A298724

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 25 2018

STATUS

approved