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A298913
Number of n X n 0..1 arrays with every element equal to 0, 3, 5, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 1, 1, 3, 7, 14, 40, 168, 873, 5632, 63538, 1026354, 20200595, 622554839, 29122695476, 1747360635695, 149225079090933
OFFSET
1,4
COMMENTS
Diagonal of A298917.
EXAMPLE
Some solutions for n=5
..0..1..0..1..0. .0..0..0..1..1. .0..0..0..0..0. .0..0..1..1..1
..1..1..1..1..1. .0..0..0..1..1. .0..0..0..0..0. .0..0..1..1..1
..0..1..1..1..0. .0..0..0..1..1. .1..1..1..1..1. .0..0..1..1..1
..1..1..1..1..1. .0..0..0..1..1. .1..1..1..1..1. .0..0..1..1..1
..0..1..0..1..0. .0..0..0..1..1. .1..1..1..1..1. .0..0..1..1..1
CROSSREFS
Cf. A298917.
Sequence in context: A147006 A146936 A184264 * A266019 A146155 A106363
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 29 2018
STATUS
approved