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 A131251 A000012 * A052509. 1
 1, 2, 1, 3, 3, 1, 4, 6, 3, 1, 5, 10, 7, 3, 1, 6, 15, 14, 7, 3, 1, 7, 21, 25, 15, 7, 3, 1, 8, 28, 41, 30, 15, 7, 3, 1, 9, 36, 63, 56, 31, 15, 7, 3, 1, 10, 45, 92, 98, 62, 31, 15, 7, 3, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums = A001924: (1, 3, 7, 14, 26, 46, 79, ...). A131252 = A052509 * A000012. From Clark Kimberling, Feb 07 2011: (Start) When formatted as a rectangle R with northwest corner 1, 2, 3, 4, 5, 6, ... 1, 3, 6, 10, 15, 21, ... 1, 3, 7, 14, 25, 41, ... 1, 3, 7, 15, 30, 56, ... 1, 3, 7, 15, 31, 62, ... ... the following properties hold: R is the accumulation array of the transpose of A052553 (a version of Pascal's triangle); see A144112 for the definition of accumulation array. row 1: A000027 row 2: A000217 row 3: A004006 row 4: A055795 row 5: A057703 row 6: A115567 limiting row: A000225 antidiagonal sums: A001924. (End) LINKS Table of n, a(n) for n=0..54. FORMULA A000012 * A052509 as infinite lower triangular matrices. EXAMPLE First few rows of the triangle: 1; 2, 1; 3, 3, 1; 4, 6, 3, 1; 5, 10, 7, 3, 1; 6, 15, 14, 7, 3, 1; 7, 21, 25, 15, 7, 3, 1; ... CROSSREFS Cf. A052509, A000012, A001924, A131252. Sequence in context: A212139 A093430 A074659 * A144400 A225281 A057145 Adjacent sequences: A131248 A131249 A131250 * A131252 A131253 A131254 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Jun 23 2007 STATUS approved

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Last modified February 23 11:40 EST 2024. Contains 370283 sequences. (Running on oeis4.)