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A298049
Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 40, 121, 512, 1708, 7014, 35804, 201703, 1158266, 7391098, 54852360
OFFSET
1,2
COMMENTS
Diagonal of A298055.
EXAMPLE
Some solutions for n=5
..0..0..1..0..0. .0..0..0..1..0. .0..0..0..1..0. .0..1..1..1..0
..1..1..0..1..1. .1..1..1..0..1. .1..1..1..0..0. .1..0..0..0..1
..0..1..1..1..0. .0..1..1..0..0. .0..0..0..0..0. .0..0..1..0..0
..0..1..0..1..0. .0..1..1..1..1. .0..1..0..1..0. .1..1..0..1..1
..1..0..1..0..1. .1..1..1..0..0. .1..1..0..1..1. .1..0..1..0..1
CROSSREFS
Cf. A298055.
Sequence in context: A183476 A297621 A014309 * A298884 A298655 A299608
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 11 2018
STATUS
approved