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 A135723 A122890 + A000012 - I, I = Identity matrix. 2
 1, 1, 1, 1, 1, 2, 1, 1, 2, 5, 1, 1, 1, 11, 14, 1, 1, 1, 9, 71, 42, 1, 1, 1, 5, 161, 425, 132, 1, 1, 1, 2, 251, 1979, 2383, 429, 1, 1, 1, 1, 303, 6277, 19509, 12805, 1430, 1, 1, 1, 1, 299, 15675, 106493, 168609, 66947, 4862 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS Row sums = A005095: (1, 2, 4, 9, 28, 125, 726,...). Main diagonal = A000108, the Catalan numbers: (1, 1, 2, 5, 14, 42, 132,...). LINKS FORMULA A122890 + A000012 - Identity matrix; as infinite lower triangular matrices. EXAMPLE First few rows of the triangle are: 1; 1, 1; 1, 1, 2; 1, 1, 2, 5; 1, 1, 1, 11, 14; 1, 1, 1, 9, 71, 42; 1, 1, 1, 5, 161, 425, 132; 1, 1, 1, 2, 251, 1979, 2383, 429; ... CROSSREFS Cf. A122890, A005095, A000108. Sequence in context: A213953 A000361 A246596 * A125311 A127568 A263791 Adjacent sequences:  A135720 A135721 A135722 * A135724 A135725 A135726 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Nov 25 2007 STATUS approved

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Last modified May 31 20:23 EDT 2020. Contains 334748 sequences. (Running on oeis4.)