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A300459
Number of n X n 0..1 arrays with every element equal to 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 1, 2, 28, 1146, 78195, 17675111, 9829599051, 14061129641181, 51771244646074395
OFFSET
1,3
COMMENTS
Diagonal of A300465.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..0..1..1. .0..0..0..0..1. .0..0..1..1..1
..0..1..1..0..0. .0..0..1..0..1. .0..1..0..1..1. .0..0..1..1..0
..0..0..0..1..1. .1..1..0..0..1. .1..1..0..1..0. .0..0..1..0..0
..1..1..0..1..0. .1..1..0..1..0. .0..0..1..0..0. .1..1..0..1..1
..1..0..0..0..0. .1..1..1..0..0. .0..1..1..0..0. .1..0..0..1..1
CROSSREFS
Cf. A300465.
Sequence in context: A292806 A113633 A186491 * A009674 A143598 A324077
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 06 2018
STATUS
approved