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A302005
Number of n X n 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.
1
1, 8, 240, 25808, 9989376, 13918667808, 69786476414080, 1259406594247832896, 81801738558534434812512, 19123141293346274424868082896, 16090014430301966976090685132636800
OFFSET
1,2
COMMENTS
Diagonal of A302010.
LINKS
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..1..0..0. .0..0..0..1..0. .0..0..1..0..0. .0..0..0..1..0
..0..0..1..1..1. .1..0..1..1..1. .0..0..0..0..1. .1..1..0..0..1
..0..1..0..0..1. .0..0..1..0..1. .0..1..0..0..0. .0..1..0..0..1
..1..1..0..0..0. .0..1..0..0..1. .0..0..1..1..1. .1..1..1..1..1
CROSSREFS
Cf. A302010.
Sequence in context: A007060 A319851 A320605 * A301778 A158263 A367629
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2018
STATUS
approved