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A207019
Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 1 vertically
1
2, 16, 90, 558, 3315, 16038, 95900, 492932, 2542374, 14009768, 70576726, 371721351, 1947251540, 9924535935, 51877222492, 266862076008, 1370454630930, 7087023247175, 36312119188998, 186625648529320, 958786992765737
OFFSET
1,1
COMMENTS
Diagonal of A207024
LINKS
EXAMPLE
Some solutions for n=4
..1..1..0..0....1..1..1..1....1..1..0..0....1..1..0..0....1..0..1..0
..1..1..0..1....1..1..1..1....1..1..0..0....0..0..1..0....0..1..0..0
..1..0..0..1....1..1..0..1....0..1..0..0....0..0..1..0....0..1..0..0
..1..0..0..1....0..1..0..1....0..1..0..0....0..0..1..0....0..1..0..0
CROSSREFS
Sequence in context: A281982 A207595 A253487 * A207164 A208113 A207448
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 14 2012
STATUS
approved