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 A157497 Triangle read by rows, A156348 * A127648 2
 1, 1, 2, 1, 0, 3, 1, 4, 0, 4, 1, 0, 0, 0, 5, 1, 6, 9, 0, 0, 6, 1, 0, 0, 0, 0, 0, 7, 1, 8, 0, 16, 0, 0, 0, 8, 1, 0, 18, 0, 0, 0, 0, 0, 9, 1, 10, 0, 0, 25, 0, 0, 0, 0, 10, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 1, 12, 30, 40, 0, 36, 0, 0, 0, 0, 0, 12 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row sums = A157020: (1, 3, 4, 9, 6, 22, 8,...) LINKS FORMULA Triangle read by rows, A156348 * A127648. A127648 = an infinite lower triangular matrix with (1, 2, 3,...) as the main diagonal and the rest zeros. EXAMPLE First few rows of the triangle = 1; 1, 2; 1, 0, 3; 1, 4, 0, 4; 1, 0, 0, 0, 5; 1, 6, 9, 0, 0, 6; 1, 0, 0, 0, 0, 0, 7; 1, 8, 0, 16, 0, 0, 0, 8; 1, 0, 18, 0, 0, 0, 0, 0, 9; 1, 10, 0, 0, 25, 0, 0, 0, 0, 10; 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11; 1, 12, 30, 40, 0, 36, 0, 0, 0, 0, 0, 12; 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13; 1, 14, 0, 0, 0, 0, 49, 0, 0, 0, 0, 0, 0, 14; ... Row 4 = (1, 4, 0, 4) = termwise products of (1, 2, 0, 1) and (1, 2, 3, 4) where (1, 2, 0, 1) = row 4 of triangle A156348. CROSSREFS Cf. A156348, A126648, A156020 Sequence in context: A246180 A102057 A276276 * A257961 A225310 A131358 Adjacent sequences: A157494 A157495 A157496 * A157498 A157499 A157500 KEYWORD nonn,tabl AUTHOR Gary W. Adamson & Mats Granvik, Mar 01 2009 STATUS approved

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Last modified March 25 14:13 EDT 2023. Contains 361524 sequences. (Running on oeis4.)