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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: A341598 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 October 5 09:16 EDT 2024. Contains 376531 sequences.
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