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A190341 Number of (n+1)X(n+1) symmetric binary matrices without the pattern 1 1 diagonally or antidiagonally 1
3, 9, 40, 273, 2727, 41520, 944307, 32403123, 1667310336, 129124175985, 15018894671481, 2626862719652352, 690390044069042835, 272767004386769371833, 161965593156881121867648 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..25

EXAMPLE

Some solutions for 3X3

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

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

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

CROSSREFS

Sequence in context: A133189 A020092 A233533 * A222669 A179088 A027893

Adjacent sequences:  A190338 A190339 A190340 * A190342 A190343 A190344

KEYWORD

nonn

AUTHOR

R. H. Hardin May 09 2011

STATUS

approved

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Last modified August 22 16:17 EDT 2019. Contains 326178 sequences. (Running on oeis4.)