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A284158
Number of n X n 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
0
1, 4, 62, 5888, 2179255, 3648835932, 25064817057781, 708804054303474038
OFFSET
1,2
COMMENTS
Diagonal of A284165.
EXAMPLE
Some solutions for n=4
..0..1..0..0. .0..0..1..1. .0..0..1..1. .0..1..1..0. .0..0..0..1
..1..0..1..1. .0..1..0..0. .0..0..1..1. .0..1..0..1. .0..0..1..0
..0..0..1..1. .1..1..0..0. .0..1..1..1. .0..1..1..0. .1..1..0..0
..1..0..1..0. .1..1..1..0. .0..1..1..1. .1..0..0..1. .1..1..1..1
CROSSREFS
Cf. A284165.
Sequence in context: A087613 A350282 A369725 * A202630 A102196 A102192
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 21 2017
STATUS
approved