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A303720 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2 or 3 king-move adjacent elements, with upper left element zero. 0
1, 8, 23, 84, 219, 569, 1476, 3614, 8730, 20886, 49351, 114833, 265877, 610405, 1396025, 3172297, 7195606, 16230944, 36563883, 82008735, 183813328, 410490052 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303727.

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303727.

Sequence in context: A208633 A036562 A320310 * A304414 A305949 A220973

Adjacent sequences:  A303717 A303718 A303719 * A303721 A303722 A303723

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 29 2018

STATUS

approved

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Last modified September 25 06:22 EDT 2022. Contains 356959 sequences. (Running on oeis4.)