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A297816
Number of n X n 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero.
0
0, 4, 48, 466, 4444, 46701, 467104, 4833331, 52153064, 578390147, 6590059758, 79294094586, 1014580074422, 13933640462306, 204079081718026
OFFSET
1,2
COMMENTS
Diagonal of A297823.
EXAMPLE
Some solutions for n=6
..0..1..0..1..1..0. .0..1..1..0..0..1. .0..0..1..0..0..1. .0..0..1..0..1..0
..0..1..0..1..0..1. .1..0..0..1..1..0. .0..1..0..1..0..1. .1..1..0..1..0..1
..1..1..0..1..0..0. .0..1..1..0..0..0. .0..1..0..1..0..1. .0..1..0..1..0..1
..0..1..0..1..1..1. .1..0..0..1..1..1. .1..1..0..1..0..0. .1..0..0..1..0..0
..0..1..0..0..0..0. .0..1..1..0..0..0. .0..1..0..1..0..1. .1..1..1..1..0..1
..0..0..1..1..1..1. .0..0..1..0..1..1. .1..0..0..1..0..1. .0..0..0..0..1..1
CROSSREFS
Cf. A297823.
Sequence in context: A111903 A059409 A357663 * A297987 A298842 A298649
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 06 2018
STATUS
approved