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 A153354 Triangle of coefficients from a polynomial recursion with row sum near =2*5^n: p(x,n)=(x + 1)*(p(x, n - 1) + 2*5^(n - 2)*(x + 5*x^Floor[n/2] + x^(n - 2))). 0
 2, 5, 5, 2, 46, 2, 2, 123, 123, 2, 2, 250, 746, 250, 2, 2, 502, 2496, 2496, 502, 2, 2, 1754, 4248, 11242, 10498, 1754, 2, 2, 8006, 12252, 46740, 52990, 18502, 8006, 2, 2, 39258, 51508, 58992, 255980, 227742, 57758, 39258, 2, 2, 195510, 247016, 110500, 1096222 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Row sums are: {2, 10, 50, 250, 1250, 6000, 29500, 146500, 730500, 3648500, 18234500,...}. The first five rows are computed by hand to row sum 2*5^n. The recursion is an approximation form. LINKS FORMULA p(x,n)=(x + 1)*(p(x, n - 1) + 2*5^(n - 2)*(x + 5*x^Floor[n/2] + x^(n - 2))). EXAMPLE {2}, {5, 5}, {2, 46, 2}, {2, 123, 123, 2}, {2, 250, 746, 250, 2}, {2, 502, 2496, 2496, 502, 2}, {2, 1754, 4248, 11242, 10498, 1754, 2}, {2, 8006, 12252, 46740, 52990, 18502, 8006, 2}, {2, 39258, 51508, 58992, 255980, 227742, 57758, 39258, 2}, {2, 195510, 247016, 110500, 1096222, 1264972, 285500, 253266, 195510, 2}, {2, 976762, 1223776, 357516, 1206722, 6267444, 5456722, 538766, 1230026, 976762, 2} MATHEMATICA Clear[p, n, m, x]' p[x, 0] = 2; p[x, 1] = 5*x + 5; p[x, 2] = 2*x^2 + 46*x + 2; p[x, 3] = 2*x^3 + 123*x^2 + 123*x + 2; p[x, 4] = 2 + 250*x + 746*x^2 + 250*x^3 + 2*x^4; p[x_, n_] := p[x, n] = (x + 1)*(p[x, n - 1] + 2*5^(n - 2)*(x + 5*x^Floor[n/ 2] + x^(n - 2))); Table[ExpandAll[p[x, n]], {n, 0, 10}]; b = Table[CoefficientList[p[x, n], x], {n, 0, 10}]; Flatten[%] CROSSREFS Sequence in context: A187340 A153518 A153648 * A153821 A153879 A074250 Adjacent sequences:  A153351 A153352 A153353 * A153355 A153356 A153357 KEYWORD nonn,uned,tabl AUTHOR Roger L. Bagula, Dec 24 2008 STATUS approved

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Last modified July 18 15:37 EDT 2019. Contains 325144 sequences. (Running on oeis4.)