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 A261214 #14 Aug 12 2015 15:57:17
%S A261214 1,-3,0,-4,-33,-283,-2785,-31291,-395360,-5544754,-85427259,
%T A261214 -1433955817,-26046643595,-509070113635,-10653941722236,
%U A261214 -237754202827284,-5636787946661521,-141514316248243499,-3751121064314067653,-104704135027419849139,-3070176356776990397500
%N A261214 Coefficients in an asymptotic expansion of sequence A259472.
%H A261214 Vaclav Kotesovec, <a href="/A261214/b261214.txt">Table of n, a(n) for n = 0..110</a>
%F A261214 a(k) ~ -3 * k! / (4 * (log(2))^(k+1)).
%F A261214 For n>0, a(n) = Sum_{k=1..n} A261239(k) * Stirling2(n-1, k-1).
%e A261214 A259472(n)/(-2*n!) ~ 1 - 3/n - 4/n^3 - 33/n^4 - 283/n^5 - 2785/n^6 - ...
%t A261214 Flatten[{1, Table[Sum[CoefficientList[Assuming[Element[x, Reals], Series[E^(3/x)*x^3/ExpIntegralEi[1/x]^3, {x, 0, 25}]], x][[k+1]] * StirlingS2[n-1, k-1], {k, 1, n}], {n, 1, 20}]}]
%Y A261214 Cf. A003319, A260503, A259472, A261239, A261253, A261254.
%K A261214 sign
%O A261214 0,2
%A A261214 _Vaclav Kotesovec_, Aug 12 2015