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A206980 Number of n X n 0..1 arrays avoiding the patterns 0 1 0 or 1 0 1 in any row, column, diagonal or antidiagonal 0
2, 16, 58, 556, 7500, 119224, 2926752, 111202694, 5582239354, 398193149976, 43178426815216, 6623459579619334, 1414003622686654366, 443957184641073369216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206987

LINKS

Table of n, a(n) for n=1..14.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A091914 A123791 A293620 * A170991 A209219 A207688

Adjacent sequences:  A206977 A206978 A206979 * A206981 A206982 A206983

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 14 2012

STATUS

approved

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Last modified November 25 11:32 EST 2020. Contains 338623 sequences. (Running on oeis4.)