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A297859 Number of n X n 0..1 arrays with every element equal to 2, 3 or 4 king-move adjacent elements, with upper left element zero. 0
0, 1, 4, 15, 2621, 284344, 76517448, 58344517697, 99045666327382, 434103508383656941 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A297866.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A297866.

Sequence in context: A299683 A295231 A070037 * A298127 A220788 A330315

Adjacent sequences:  A297856 A297857 A297858 * A297860 A297861 A297862

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 07 2018

STATUS

approved

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Last modified August 9 12:39 EDT 2020. Contains 336323 sequences. (Running on oeis4.)