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A208550 Number of n X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 0 1 1 vertically. 1
2, 16, 90, 1089, 10080, 150544, 1913940, 33930625, 544003170, 11177987076, 215177010048, 5033386477441, 112708053008152, 2958949185458176, 75387859827570360, 2195709810260687361, 62623865365172370000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A208555.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..38

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A208555.

Sequence in context: A207448 A207362 A208008 * A214824 A317451 A220324

Adjacent sequences: A208547 A208548 A208549 * A208551 A208552 A208553

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 28 2012

STATUS

approved

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Last modified January 31 01:17 EST 2023. Contains 359947 sequences. (Running on oeis4.)