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A297808 Number of nXn 0..1 arrays with every element equal to 2 or 3 king-move adjacent elements, with upper left element zero. 0
0, 1, 0, 8, 24, 83, 88, 838, 2234, 15799, 62938, 432302, 2162292, 14402163, 89993438, 752458227, 5948078028 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Diagonal of A297814.

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297814.

Sequence in context: A146534 A180888 A296400 * A097544 A128688 A279162

Adjacent sequences:  A297805 A297806 A297807 * A297809 A297810 A297811

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2018

STATUS

approved

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Last modified October 22 08:00 EDT 2019. Contains 328315 sequences. (Running on oeis4.)