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A190416 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 antidiagonally 1
48, 432, 7776, 279936, 18475776, 2235568896, 491825157120, 196730062848000, 145580246507520000, 199299357468794880000, 501437183391487918080000, 2318645536002240133201920000, 19708487056019041132216320000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..58

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A172201 A249293 A281374 * A231342 A192828 A259851

Adjacent sequences:  A190413 A190414 A190415 * A190417 A190418 A190419

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2011

STATUS

approved

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Last modified January 19 10:19 EST 2021. Contains 340269 sequences. (Running on oeis4.)