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A305636 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 0
1, 4, 29, 334, 8734, 385282, 42274045, 12972861669, 10445509134407 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A305642.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305642.

Sequence in context: A118795 A325478 A099700 * A276728 A256006 A137646

Adjacent sequences:  A305633 A305634 A305635 * A305637 A305638 A305639

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 07 2018

STATUS

approved

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Last modified May 23 21:44 EDT 2022. Contains 353993 sequences. (Running on oeis4.)