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A300499
Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
1, 3, 4, 20, 56, 1162, 17412, 1045409, 76908966, 12262865881
OFFSET
1,2
COMMENTS
Diagonal of A300506.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..1..1..1..0. .0..1..1..0..0. .0..0..0..1..0
..0..1..0..0..0. .0..0..1..1..0. .0..0..0..0..0. .1..0..0..0..1
..1..1..0..0..0. .0..0..1..1..1. .0..0..1..1..0. .1..1..0..1..0
..1..1..1..1..0. .0..0..0..1..1. .1..0..0..0..0. .1..1..0..0..1
..0..1..1..1..1. .1..0..0..0..1. .1..0..0..1..0. .0..1..0..0..0
CROSSREFS
Cf. A300506.
Sequence in context: A226964 A222763 A306668 * A151419 A067281 A326424
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 07 2018
STATUS
approved