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A300429
Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 2, 13, 87, 704, 6677, 75553, 1012416, 16998387, 349644776, 9034633150
OFFSET
1,2
COMMENTS
Diagonal of A300435.
EXAMPLE
Some solutions for n=5
..0..0..1..0..1. .0..0..1..0..0. .0..0..1..0..1. .0..0..0..1..1
..0..1..0..1..0. .0..1..1..1..1. .1..0..1..0..1. .0..0..1..0..0
..1..0..1..0..0. .1..1..0..0..0. .1..0..1..0..0. .0..1..0..1..0
..1..0..1..1..1. .0..1..1..1..1. .1..0..1..1..0. .1..0..1..0..1
..1..0..0..0..1. .0..0..0..0..0. .1..0..0..1..1. .1..0..0..1..1
CROSSREFS
Cf. A300435.
Sequence in context: A091116 A091099 A092849 * A106938 A106937 A033891
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 2018
STATUS
approved