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A190601 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 0 1 antidiagonally 1
48, 576, 11520, 403200, 25401600, 2743372800, 526727577600, 176980466073600, 104064514051276800, 107810836557122764800, 195461046678063572582400, 622543433669632478674944000, 3480017794213245555792936960000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..49

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A245953 A192832 A042949 * A179404 A171343 A151624

Adjacent sequences:  A190598 A190599 A190600 * A190602 A190603 A190604

KEYWORD

nonn

AUTHOR

R. H. Hardin May 13 2011

STATUS

approved

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Last modified October 25 00:01 EDT 2020. Contains 338010 sequences. (Running on oeis4.)