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 A323667 Expansion of e.g.f. exp(BesselI(0,2*x) + BesselI(1,2*x) - 1). 0
 1, 1, 3, 10, 43, 211, 1191, 7463, 51535, 386809, 3133273, 27184620, 251253157, 2461527511, 25459020289, 276987375642, 3160197122183, 37705878268985, 469340324930493, 6081394853597162, 81866045488063721, 1142928276326927223, 16521454311961005245, 246917508673451732077 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA a(0) = 1; a(n) = Sum_{k=1..n} A001405(k)*binomial(n-1,k-1)*a(n-k). MAPLE seq(n!*coeff(series(exp(BesselI(0, 2*x)+BesselI(1, 2*x)-1), x=0, 24), x, n), n=0..23); # Paolo P. Lava, Jan 28 2019 MATHEMATICA nmax = 23; CoefficientList[Series[Exp[BesselI[0, 2 x] + BesselI[1, 2 x] - 1], {x, 0, nmax}], x] Range[0, nmax]! a[n_] := a[n] = Sum[Binomial[k, Floor[k/2]] Binomial[n - 1, k - 1] a[n - k], {k, 1, n}]; a[0] = 1; Table[a[n], {n, 0, 23}] PROG (PARI) my(x='x + O('x^25)); Vec(serlaplace(exp(besseli(0, 2*x)+x*besseli(1, 2*x)-1))) \\ Michel Marcus, Jan 24 2019 CROSSREFS Cf. A001405, A302197, A304788. Sequence in context: A151085 A082936 A205487 * A030935 A132428 A030890 Adjacent sequences:  A323664 A323665 A323666 * A323668 A323670 A323671 KEYWORD nonn AUTHOR Ilya Gutkovskiy, Jan 23 2019 STATUS approved

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Last modified March 25 10:08 EDT 2019. Contains 321469 sequences. (Running on oeis4.)