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A298383
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.
0
0, 4, 56, 996, 49850, 3935913, 509195874, 190487814086, 121220201152514
OFFSET
1,2
COMMENTS
Diagonal of A298389.
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..1..1..0..0. .0..1..0..1..1. .0..1..1..0..1
..1..0..1..0..1. .1..0..1..1..0. .1..0..0..0..0. .1..0..0..1..1
..1..1..1..0..1. .1..1..1..1..1. .0..1..0..0..1. .0..1..1..1..0
..1..0..0..1..0. .0..1..1..0..0. .0..1..0..1..0. .1..1..1..1..0
..1..0..1..1..1. .1..0..0..1..1. .1..0..1..1..0. .0..0..1..0..1
CROSSREFS
Cf. A298389.
Sequence in context: A297944 A298555 A240298 * A326289 A369534 A078533
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 18 2018
STATUS
approved