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A305009 Number of n X n 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 0
0, 3, 14, 42, 2715, 28477, 640900, 108290760, 7783586346, 1272340558178 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A305015.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305015.

Sequence in context: A124650 A291138 A063903 * A115005 A058389 A261481

Adjacent sequences:  A305006 A305007 A305008 * A305010 A305011 A305012

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 23 2018

STATUS

approved

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Last modified June 14 15:44 EDT 2021. Contains 345025 sequences. (Running on oeis4.)