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A207105 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically 0
2, 16, 98, 643, 4047, 22714, 139341, 794118, 4654884, 27655332, 162017453, 985389943, 5963777274, 36963453329, 232521285314, 1479703961900, 9627524117464 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A207111

LINKS

Table of n, a(n) for n=1..17.

EXAMPLE

Some solutions for n=4

..1..1..1..1....0..0..1..0....1..0..0..1....1..1..0..1....1..1..1..0

..1..1..0..0....1..0..1..0....0..1..0..0....0..0..1..0....0..1..0..0

..1..1..1..1....0..0..1..0....1..1..0..1....0..1..0..1....0..1..0..0

..1..1..0..0....0..0..1..0....0..1..0..0....0..0..1..0....0..1..0..0

CROSSREFS

Sequence in context: A005058 A082639 A207301 * A207387 A207934 A207780

Adjacent sequences:  A207102 A207103 A207104 * A207106 A207107 A207108

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 15 2012

STATUS

approved

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Last modified January 21 13:55 EST 2020. Contains 331113 sequences. (Running on oeis4.)