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 A249757 Triangular array of coefficients of polynomials p(n,x) = (x + 1)*p(n-1,x) + 2*n*x, p(0,x) = 1. 2
 1, 1, 3, 1, 8, 3, 1, 15, 11, 3, 1, 24, 26, 14, 3, 1, 35, 50, 40, 17, 3, 1, 48, 85, 90, 57, 20, 3, 1, 63, 133, 175, 147, 77, 23, 3, 1, 80, 196, 308, 322, 224, 100, 26, 3, 1, 99, 276, 504, 630, 546, 324, 126, 29, 3, 1, 120, 375, 780, 1134, 1176, 870, 450, 155 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS (Sum of numbers in row n) = A097809(n) for n >= 0. LINKS Clark Kimberling, Rows n = 0..100, flattened EXAMPLE p(0,x) = 1 p(1,x) = 1 + 3*x p(2,x) = 1 + 8*x + 3*x^2 First 6 rows: 1 1   3 1   8    3 1   15   11    3 1   24   26    14   3 1   35   50    40   17   3 MATHEMATICA z = 14; p[n_, x_] := (x + 1) p[n - 1, x] + 2*n*x; p[0, x_] = 1; t = Table[Factor[p[n, x]], {n, 0, z}] TableForm[Rest[Table[CoefficientList[t[[n]], x], {n, 0, z}]]] (* A249757 array *) Flatten[CoefficientList[t, x]] (* A249757 sequence *) CROSSREFS Cf. A249755, A249756, A097809. Sequence in context: A185452 A179449 A049541 * A207609 A322428 A130300 Adjacent sequences:  A249754 A249755 A249756 * A249758 A249759 A249760 KEYWORD nonn,tabl,easy AUTHOR Clark Kimberling, Nov 07 2014 STATUS approved

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Last modified August 12 12:15 EDT 2020. Contains 336439 sequences. (Running on oeis4.)