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A301835
Number of n X n 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
1, 8, 139, 5748, 496085, 97439921, 41966406867, 39919204098331, 84196647385137200, 391960289300558475785, 4034683591387591205214712, 91832712356420807374009031299, 4618825005074327343319160956639454
OFFSET
1,2
COMMENTS
Diagonal of A301841.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..0..1..0..0. .0..0..1..0..0. .0..0..1..0..0
..1..0..1..0..1. .0..1..0..1..0. .0..1..0..1..0. .0..0..0..1..0
..1..0..1..0..0. .1..0..1..1..0. .1..0..0..1..0. .1..1..0..1..1
..0..0..1..0..1. .1..0..0..1..1. .1..0..1..0..0. .1..1..0..1..0
..0..0..1..0..0. .0..1..0..1..1. .0..0..1..0..1. .1..1..1..0..0
CROSSREFS
Cf. A301841.
Sequence in context: A050789 A274669 A187236 * A091060 A201094 A061996
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 27 2018
STATUS
approved