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 A131399 3*A007318 - A046854 - A065941. 0
 1, 1, 1, 1, 4, 1, 1, 6, 6, 1, 1, 9, 12, 9, 1, 1, 11, 23, 23, 11, 1, 1, 14, 34, 52, 34, 14, 1, 1, 16, 51, 90, 90, 51, 16, 1, 1, 19, 67, 152, 180, 152, 67, 19, 1, 1, 21, 90, 225, 342, 342, 225, 90, 21, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS Row sums = A074878: (1, 2, 6, 14, 32, 70, 150,...). LINKS FORMULA 3*A007318 - A046854 - A065941 as infinite lower triangular matrices. EXAMPLE First few rows of the triangle are: 1; 1, 1; 1, 4, 1; 1, 6, 6, 1; 1, 9, 12, 9, 1; 1, 11, 23, 23, 11, 1; 1, 14, 34, 52, 34, 14, 1; 1, 16, 51, 90, 90, 51, 16, 1; ... CROSSREFS Cf. A007318, A046854, A065941, A074878. Sequence in context: A144480 A144463 A174376 * A069322 A208332 A075112 Adjacent sequences:  A131396 A131397 A131398 * A131400 A131401 A131402 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Jul 05 2007 STATUS approved

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Last modified September 22 12:34 EDT 2020. Contains 337289 sequences. (Running on oeis4.)