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A306054 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 0
1, 4, 27, 164, 3572, 99928, 3363541, 257823074, 35799252324, 7129093557510 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A306060.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A306060.

Sequence in context: A278358 A274751 A015534 * A218274 A061693 A005974

Adjacent sequences:  A306051 A306052 A306053 * A306055 A306056 A306057

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 18 2018

STATUS

approved

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Last modified November 28 04:13 EST 2021. Contains 349400 sequences. (Running on oeis4.)