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A207420
Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically
0
2, 16, 114, 1521, 55361, 3892729, 474552171, 116947584576, 59951676534906, 60921409199181129, 121441530119384020545, 483128923550195512221129, 3857404253001354057074186601, 61418617253685924322130029824769
OFFSET
1,1
COMMENTS
Diagonal of A207426
EXAMPLE
Some solutions for n=4
..1..0..1..1....1..1..1..0....1..0..0..1....0..0..1..1....0..1..1..0
..0..0..1..1....0..0..1..1....1..0..1..1....1..1..1..0....1..0..1..1
..1..0..1..1....0..1..1..1....0..0..1..1....1..1..0..0....1..0..0..1
..1..0..0..1....0..1..1..1....1..0..0..1....1..1..1..0....0..0..1..1
CROSSREFS
Sequence in context: A361743 A125725 A288965 * A207736 A208364 A207711
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 17 2012
STATUS
approved