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 A191569 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 knight-move neighboring 1 0
 2, 8, 34, 183, 2129, 33462, 770926, 26032324, 1354203171, 103491528931, 11756048816408, 2008909410467497, 510889483445894680, 194267241325094317359, 109588026470607538438518 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..15. EXAMPLE Some solutions for n=6 ..1..0..0..0..0..0....1..0..1..1..0..0....1..0..0..0..0..0....0..1..0..0..1..1 ..0..0..0..0..0..1....0..0..0..1..0..0....0..1..0..0..1..1....1..1..0..0..1..0 ..0..0..1..0..0..0....1..0..0..0..0..0....0..0..0..0..1..1....0..0..0..0..1..1 ..0..0..0..0..0..0....1..1..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..1..1....0..1..1..0..0..0....1..1..1..0..0..0 ..0..1..0..0..0..1....0..0..0..0..1..0....0..1..1..0..0..1....1..0..1..0..0..1 CROSSREFS Sequence in context: A061370 A126328 A268558 * A229812 A346413 A013026 Adjacent sequences: A191566 A191567 A191568 * A191570 A191571 A191572 KEYWORD nonn AUTHOR R. H. Hardin Jun 06 2011 STATUS approved

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Last modified June 10 14:12 EDT 2023. Contains 363205 sequences. (Running on oeis4.)