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A302206
Number of n X n 0..1 arrays with every element equal to 0, 2 or 3 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 2, 16, 7, 448, 1395, 55922, 3509969, 73189971, 33707749345, 2102356505182
OFFSET
1,2
COMMENTS
Diagonal of A302212.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..1..0..0..1. .0..0..0..1..0. .0..0..1..1..0
..1..1..1..0..1. .0..1..0..0..1. .1..0..1..1..1. .0..0..1..1..0
..0..1..1..0..1. .1..1..1..0..0. .1..0..0..1..0. .1..0..1..1..0
..0..1..0..0..0. .0..0..0..1..1. .1..0..0..1..0. .0..0..0..1..1
..1..1..1..0..1. .0..0..1..1..0. .1..0..0..1..0. .1..0..0..1..1
CROSSREFS
Cf. A302212.
Sequence in context: A211367 A351585 A220314 * A110008 A296728 A110875
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 03 2018
STATUS
approved