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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: A249293 A347168 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 December 8 21:28 EST 2022. Contains 358698 sequences. (Running on oeis4.)