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A300532
Number of n X n 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 12, 300, 12951, 1972991, 831752031, 946782030618, 2954430191005674, 25119015182967409981
OFFSET
1,2
COMMENTS
Diagonal of A300539.
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..1..1..1..1. .0..0..0..1..0. .0..0..1..1..0
..0..1..0..1..1. .1..0..1..0..1. .0..1..0..0..0. .0..0..1..0..0
..1..1..0..1..1. .1..1..1..1..0. .1..1..0..1..0. .0..1..1..0..0
..0..1..0..0..1. .1..0..0..1..1. .1..1..0..0..1. .0..0..1..0..1
..1..1..0..1..1. .0..0..1..1..0. .1..0..0..1..1. .0..0..1..1..1
CROSSREFS
Cf. A300539.
Sequence in context: A280086 A369186 A102945 * A249940 A132515 A279122
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 08 2018
STATUS
approved