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 A195287 a(n) = (A091137(n)/n!) * Integral_{u=-1..1} u*(u+1)*...*(u+n-1) du. 3
 2, 0, 4, 8, 232, 448, 18224, 35424, 1036064, 2025472, 130960832, 257072000, 689908475264, 1358275350528, 8031885897472, 15847920983552, 7981032500085248, 15774370258485248, 12448755354530366464 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Numerators of the second row of an array based on Adams numerical integration. Take q!*s(m,q) = Integral_{-m-1..1} u*(u+1)*...*(u+q-1) du. a(n) is in the second row (case m=0) numerators of s(m,q) in the comments. The unreduced array s(m,q), (m=-1,0,1,...,   columns q=0,1,2,...) is 1,   1/2,   5/12,   9/24,   251/720, 475/1440,  = A002657(n)/A091137(n), 2,     0,   4/12,   8/24,   232/720, 448/1440,  = a(n)/A091137(n), 3,  -3/2,   9/12,   9/24,   243/720, 459/1440, 4,  -8/2,  32/12,      0,   224/720, 448/1440, 5, -15/2,  85/12, -55/24,   475/720, 475/1440, 6, -24/2, 180/12, -216/24, 2376/720,        0. Column numerators: A000027, -A067998(n), A152064(n), A157371(n), A165281(n). Page 56 of the reference. (*) 2/2 = 1,     2/2 + 0 = 1,     2/3 + 0 + 1/3 = 1,     2/4 + 0 + 1/6 + 1/3 = 1. Reduced. REFERENCES P. Curtz, Intégration numérique des systèmes differentiels à conditions initiales, Centre de Calcul Scientifique de l'Armement, Arcueil, 1969. LINKS FORMULA b(n) = a(n)/A091137(n). b(0)/2 = 1, b(0)/2 + b(1) = 1, b(0)/3 + b(1)/2 + b(2) = 1, b(0)/4 + b(1)/3 + b(2)/2 + b(3) = 1. First vertical denominators: A028310(n) + 1. See A104661. Values in (*). MAPLE A195287 := proc(n)         mul(u+i, i=0..n-1) ;         int(%, u=-1..1) ;         %/n!*A091137(n) ; end proc: seq(A195287(n), n=0..20) ; # R. J. Mathar, Oct 02 2011 MATHEMATICA (* a7 = A091137 *) a7[n_] := a7[n] = Product[d, {d, Select[Divisors[n] + 1, PrimeQ]}]*a7[n-1]; a7[0]=1; a[n_] := a7[n]/n!*Integrate[ Pochhammer[u, n], {u, -1, 1}]; Table[a[n], {n, 0, 18}] (* Jean-François Alcover, Aug 13 2012 *) CROSSREFS Sequence in context: A101189 A295321 A001443 * A070015 A021492 A342201 Adjacent sequences:  A195284 A195285 A195286 * A195288 A195289 A195290 KEYWORD nonn AUTHOR Paul Curtz, Sep 20 2011 STATUS approved

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Last modified July 24 05:05 EDT 2021. Contains 346273 sequences. (Running on oeis4.)