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 A194992 Number of lower triangles of an nXn 0..2 array with each element differing from all of its horizontal and vertical neighbors by one 1
 3, 6, 20, 80, 576, 4608, 69632, 1114112, 34603008, 1107296256, 69793218560, 4466765987840, 567347999932416, 72620543991349248, 18518801667747479552, 4740813226943354765312, 2422574005712127994626048 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A194998 LINKS R. H. Hardin, Table of n, a(n) for n = 1..89 EXAMPLE Some solutions for 4X4 ..2........1........0........2........0........0........0........0 ..1.0......2.1......1.2......1.0......1.0......1.0......1.0......1.0 ..2.1.2....1.2.1....0.1.0....2.1.2....2.1.0....0.1.0....2.1.0....2.1.0 ..1.0.1.0..2.1.2.1..1.2.1.0..1.2.1.0..1.2.1.2..1.0.1.2..1.2.1.0..1.0.1.2 CROSSREFS Sequence in context: A168594 A123559 A162171 * A163881 A019017 A019049 Adjacent sequences:  A194989 A194990 A194991 * A194993 A194994 A194995 KEYWORD nonn AUTHOR R. H. Hardin Sep 07 2011 STATUS approved

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Last modified May 20 02:52 EDT 2013. Contains 225446 sequences.