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 A190536 Number of (n+2)X(n+2) symmetric binary matrices without the pattern 0 1 1 diagonally or antidiagonally 1
 56, 528, 6600, 100980, 2117870, 61630794, 2607217770, 156166134300, 13953736838272, 1844353230617676, 367051670671034640, 109228902733245482050, 48925662805948380686500 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..18 EXAMPLE Some solutions for 4X4 ..1..1..1..0....0..0..1..0....0..1..0..0....1..1..1..1....0..0..0..0 ..1..0..0..0....0..0..0..1....1..1..0..0....1..1..1..1....0..1..0..1 ..1..0..0..1....1..0..1..0....0..0..0..0....1..1..1..0....0..0..0..0 ..0..0..1..0....0..1..0..0....0..0..0..1....1..1..0..0....0..1..0..1 CROSSREFS Sequence in context: A219576 A219943 A204832 * A190070 A220930 A220209 Adjacent sequences: A190533 A190534 A190535 * A190537 A190538 A190539 KEYWORD nonn AUTHOR R. H. Hardin May 12 2011 STATUS approved

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Last modified April 22 02:54 EDT 2024. Contains 371887 sequences. (Running on oeis4.)