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A303801 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero. 0
1, 5, 9, 38, 100, 316, 1217, 8004, 52464, 501170, 4720512, 60221097, 817581575 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A303808.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303808.

Sequence in context: A200376 A098477 A243762 * A304849 A270622 A270673

Adjacent sequences:  A303798 A303799 A303800 * A303802 A303803 A303804

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 30 2018

STATUS

approved

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Last modified January 25 19:09 EST 2020. Contains 331249 sequences. (Running on oeis4.)