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A300917
Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 20, 593, 48588, 14914968, 13715723327, 40555879417852, 372826575580930236, 10763317686740172159278
OFFSET
1,2
COMMENTS
Diagonal of A300923.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..0..0..0..1. .0..0..1..0..1. .0..0..1..0..0
..1..1..1..1..1. .0..0..0..1..1. .0..1..1..1..1. .0..0..0..0..0
..1..0..1..0..0. .0..1..1..1..0. .0..0..0..0..0. .1..0..1..0..0
..1..1..1..0..0. .0..1..0..0..0. .0..0..0..0..0. .0..1..1..0..0
..0..1..0..0..0. .0..0..0..0..1. .1..0..1..0..0. .0..0..0..0..1
CROSSREFS
Cf. A300923.
Sequence in context: A189603 A203228 A174972 * A089943 A108699 A162134
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 15 2018
STATUS
approved