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 A347949 E.g.f.: 1 / (1 - Sum_{k>=1} x^prime(k) / prime(k)). 1
 1, 0, 1, 2, 6, 64, 170, 2988, 14616, 180192, 1934712, 21673200, 300266736, 4220710272, 61785461712, 1003589762784, 17448621367680, 327598207658496, 6279739240655232, 134169095009652480, 2817563310900129024, 64570676279407718400, 1547773850801172960000, 38824156236466815920640 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS FORMULA a(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * (k-1)! * A010051(k) * a(n-k). MATHEMATICA nmax = 23; CoefficientList[Series[1/(1 - Sum[x^Prime[k]/Prime[k], {k, 1, nmax}]), {x, 0, nmax}], x] Range[0, nmax]! a[0] = 1; a[n_] := a[n] = Sum[Binomial[n, k] (k - 1)! Boole[PrimeQ[k]] a[n - k], {k, 1, n}]; Table[a[n], {n, 0, 23}] CROSSREFS Cf. A007840, A010051, A023360, A218002, A347948. Sequence in context: A030170 A082640 A139695 * A241590 A052522 A193609 Adjacent sequences:  A347946 A347947 A347948 * A347950 A347951 A347952 KEYWORD nonn AUTHOR Ilya Gutkovskiy, Sep 20 2021 STATUS approved

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Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)