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 A135853 A103516 * A007318 as an infinite lower triangular matrix. 3
 1, 4, 2, 6, 6, 3, 8, 12, 12, 4, 10, 20, 30, 20, 5, 12, 30, 60, 60, 30, 6, 14, 42, 105, 140, 105, 42, 7, 16, 56, 168, 280, 280, 168, 56, 8, 18, 72, 252, 504, 630, 504, 252, 72, 9, 20, 90, 360, 840, 1260, 1260, 840, 360, 90, 10 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS G. C. Greubel, Table of n, a(n) for the first 50 rows FORMULA A135852 = A007318 * A103516. T(n, n) = n, T(n, 1) = 2*n, T(n, k) = k*binomial(n, k). - G. C. Greubel, Dec 07 2016 EXAMPLE First few rows of the triangle are:    1;    4,   2;    6,   6,  3;    8,  12,  12,   4;   10,  20,  30,  20,   5;   12,  30,  60,  60,  30,   6;   14,  42, 105, 140, 105,  42,   7;   ... MATHEMATICA T[n_, n_] := n; T[n_, 1] := 2*n; T[n_, k_] := k*Binomial[n, k]; Table[T[n, k], {n, 1, 25}, {k, 1, n}]//flatten (* G. C. Greubel, Dec 07 2016 *) CROSSREFS Cf. A103516, A135854 (row sums), A135852. Sequence in context: A228084 A188941 A200347 * A173197 A256568 A138947 Adjacent sequences:  A135850 A135851 A135852 * A135854 A135855 A135856 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Dec 01 2007 STATUS approved

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Last modified September 21 02:46 EDT 2020. Contains 337266 sequences. (Running on oeis4.)