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A301348
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 3, 53, 2349, 264054, 78012336, 59990521481, 119913579672155, 622564600937446253, 8402046535849070738107
OFFSET
1,2
COMMENTS
Diagonal of A301354.
EXAMPLE
Some solutions for n=5
..0..0..0..1..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..0..0
..1..1..1..0..1. .1..1..1..0..1. .1..1..0..1..0. .0..1..1..0..1
..1..0..1..0..0. .0..0..1..0..1. .0..0..0..1..0. .1..0..0..1..1
..0..1..0..1..1. .0..0..1..0..0. .1..1..0..1..1. .1..0..1..0..1
..1..1..0..0..1. .1..1..1..1..0. .1..0..0..0..1. .0..1..0..0..0
CROSSREFS
Cf. A301354.
Sequence in context: A296678 A227051 A300606 * A296680 A118194 A325725
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 19 2018
STATUS
approved