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A206988 Number of n X n 0..1 arrays avoiding 0 0 0 horizontally and 1 1 1 vertically 0
2, 16, 174, 6510, 516724, 88819714, 37849652838, 36679559167444, 82039130470188394, 429029852979061855882, 5194153238714571994969836, 145816870651378340099973452074 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206994

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A155659 A108999 A138014 * A217360 A052606 A011553

Adjacent sequences:  A206985 A206986 A206987 * A206989 A206990 A206991

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)