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A303320
Number of n X n 0..1 arrays with every element equal to 0, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
0
1, 2, 4, 2, 64, 56, 2956, 24759, 3531980, 122180446, 68902353881
OFFSET
1,2
COMMENTS
Diagonal of A303325.
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..0..0..0..0. .0..1..1..1..0. .0..0..0..0..0
..0..1..1..1..0. .1..0..1..0..1. .0..1..1..1..0. .1..0..1..0..1
..1..1..1..1..1. .0..0..0..0..0. .0..1..0..1..0. .1..0..1..0..1
..0..0..1..0..0. .1..1..1..1..1. .0..1..1..1..0. .1..0..1..0..1
..0..0..1..0..0. .0..1..0..1..0. .1..1..0..1..1. .0..0..0..0..0
CROSSREFS
Cf. A303325.
Sequence in context: A259685 A301460 A130172 * A029589 A121819 A134138
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 21 2018
STATUS
approved