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 A134392 A077028 * A000012, that is Rascal's triangle (as matrix) multiplied by a lower triangular matrix of ones (main diagonal of ones included). 1
 1, 2, 1, 4, 3, 1, 8, 7, 4, 1, 15, 14, 10, 5, 1, 26, 25, 20, 13, 6, 1, 42, 41, 35, 26, 16, 7, 1, 64, 63, 56, 45, 32, 19, 8, 1, 93, 92, 84, 71, 55, 38, 22, 9, 1, 130, 129, 120, 105, 86, 65, 44, 25, 10, 1, 176, 175, 165, 148, 126, 101, 75, 50, 28, 11, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Left border = A000125. Row sums = A134393: (1, 3, 8, 20, 45, 91, 168, 288,...). LINKS FORMULA A077028 * A000012 as infinite lower triangular matrices. Triangle read by rows, partial sums starting from the right of A077028. EXAMPLE First few rows of the triangle are; 1; 2, 1; 4, 3, 1; 8, 7, 4, 1; 15, 14, 10, 5, 1; 26, 25, 20, 13, 6, 1; 42, 41, 35, 26, 16, 7, 1; ... MATHEMATICA rows = 11; R[n_, k_] /; k <= n := k (n - k) + 1; R[0, 0] = 1; R[_, _] = 0; MR = Table[R[n, k], {n, 0, rows-1}, {k, 0, rows-1}]; MB = Table[Boole[0 <= k <= n], {n, 0, rows-1}, {k, 0, rows -1}]; T = MR.MB; Table[T[[n, k]], {n, 1, rows}, {k, 1, n}] // Flatten (* Jean-François Alcover, Apr 01 2020 *) CROSSREFS Cf. A077028, A000125, A134393. Sequence in context: A134626 A115450 A109435 * A048483 A276562 A055248 Adjacent sequences:  A134389 A134390 A134391 * A134393 A134394 A134395 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Oct 23 2007 EXTENSIONS Typos corrected by Jean-François Alcover, Apr 01 2020 STATUS approved

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Last modified October 21 16:40 EDT 2020. Contains 337918 sequences. (Running on oeis4.)