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 A191295 Number of n X n symmetric binary matrices with each 1 adjacent to exactly 2 knight-move neighboring 1s 0
 1, 1, 2, 17, 61, 241, 1077, 10002, 130992, 2166639, 41299118, 1000354787, 34454184106 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS EXAMPLE Some solutions for n=4 ..0..1..0..0....0..0..0..0....0..1..0..0....1..0..0..1....1..1..1..0 ..1..1..0..1....0..0..0..0....1..0..1..1....0..1..1..0....1..0..1..0 ..0..0..1..1....0..0..0..0....0..1..1..0....0..1..1..0....1..1..1..0 ..0..1..1..0....0..0..0..0....0..1..0..1....1..0..0..1....0..0..0..0 CROSSREFS Sequence in context: A071402 A228641 A226417 * A002430 A160469 A176581 Adjacent sequences:  A191292 A191293 A191294 * A191296 A191297 A191298 KEYWORD nonn AUTHOR R. H. Hardin May 29 2011 STATUS approved

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Last modified October 22 01:38 EDT 2018. Contains 316431 sequences. (Running on oeis4.)