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 A053454 Number of weakly connected digraphs with n arcs. 5
 1, 1, 4, 12, 53, 237, 1306, 7537, 47913, 322253, 2297874, 17191216, 134505656, 1095715055, 9267223594, 81162609328, 734511656413, 6856030049629, 65899370570285, 651338242941020, 6611459646337423, 68842439737228261 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Andrew Howroyd, Table of n, a(n) for n = 0..50 FORMULA Inverse Euler transform of A053418. - Max Alekseyev, Jan 22 2010 PROG (PARI) \\ See A054733 for G, InvEulerMTS. seq(n)=Vec(subst(Pol(InvEulerMTS(sum(i=0, n, G(i, y+O(y^n))*x^i, O(x*x^n)))), x, 1)) \\ Andrew Howroyd, Jan 28 2022 CROSSREFS Column sums of A054733. Row sums of A350789. Cf. A003085, A053418, A350752. Sequence in context: A180381 A149413 A149414 * A149415 A149416 A149417 Adjacent sequences: A053451 A053452 A053453 * A053455 A053456 A053457 KEYWORD nonn AUTHOR Vladeta Jovovic, Jan 12 2000 EXTENSIONS Extended by Max Alekseyev, Jan 22 2010 a(0)=1 prepended by Andrew Howroyd, Jan 28 2022 STATUS approved

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Last modified May 31 19:08 EDT 2023. Contains 363068 sequences. (Running on oeis4.)