This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A277482 #10 Nov 10 2017 07:37:10
%S A277482 0,0,2,9,56,480,5394,75775,1280376,25270056,569899770,14444562803,
%T A277482 406204015524,12545427045008,422007399953398,15354968442741135,
%U A277482 600807449737710832,25153741340051795248,1121917008608064151218,53107023489332468636739,2658946993059795072656540
%N A277482 E.g.f.: log(1-x)*LambertW(-x).
%H A277482 G. C. Greubel, <a href="/A277482/b277482.txt">Table of n, a(n) for n = 0..385</a>
%F A277482 a(n) ~ -log(1-exp(-1)) * n^(n-1).
%t A277482 CoefficientList[Series[Log[1-x]*LambertW[-x], {x, 0, 20}], x] * Range[0, 20]!
%t A277482 Table[n!*Sum[k^(k-1)/(k!*(n-k)), {k, 1, n-1}], {n, 0, 20}] (* _Vaclav Kotesovec_, Oct 28 2016 *)
%o A277482 (PARI) x='x+O('x^50); concat([0,0], Vec(serlaplace(log(1-x)*lambertw(-x)) )) \\ _G. C. Greubel_, Nov 09 2017
%Y A277482 Cf. A000169, A277466, A277473, A277481.
%K A277482 nonn
%O A277482 0,3
%A A277482 _Vaclav Kotesovec_, Oct 17 2016