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A304927 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 5 or 7 king-move adjacent elements, with upper left element zero. 0
1, 5, 13, 73, 452, 2653, 15993, 118024, 920997, 12184613, 162877680, 2507024025, 36984184204, 682363665419 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304931.

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304931.

Sequence in context: A137702 A140120 A303962 * A163732 A208821 A293259

Adjacent sequences:  A304924 A304925 A304926 * A304928 A304929 A304930

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 21 2018

STATUS

approved

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Last modified July 6 05:39 EDT 2022. Contains 355108 sequences. (Running on oeis4.)