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A304215
Number of n X n 0..1 arrays with every element unequal to 0, 1, 3 or 8 king-move adjacent elements, with upper left element zero.
0
1, 5, 10, 32, 141, 740, 4263, 33924, 451917, 7831308, 167764973, 5472669192, 258530463654, 15734556958302, 1343566924722008, 166506641101860333, 27977584863900148454, 6451992368321000124567, 2112336251628682183231929
OFFSET
1,2
COMMENTS
Diagonal of A304221.
EXAMPLE
Some solutions for n=7
..0..1..1..1..1..1..1. .0..1..1..1..1..1..0. .0..0..0..0..0..0..1
..1..1..1..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..0..0..0..0
..1..1..1..1..1..1..1. .1..1..1..1..1..1..1. .0..0..1..0..0..0..0
..1..1..1..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..0..0..0..0
..1..1..1..1..1..1..1. .1..1..1..0..1..1..1. .0..0..0..0..0..0..0
..1..1..1..1..1..1..0. .1..1..1..1..1..1..1. .0..0..0..0..0..0..1
..1..1..1..1..1..0..0. .1..1..1..1..1..1..1. .0..0..0..0..0..1..1
CROSSREFS
Cf. A304221.
Sequence in context: A094234 A052538 A240413 * A073705 A355900 A328130
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 08 2018
STATUS
approved