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 A080831 #8 Jun 23 2025 03:41:11
%S A080831 1,1,2,7,35,218,1619,13973,137216,1508981,18360015,244770120,
%T A080831 3547043469,55499654941,932309976082,16732137304363,319458645821311,
%U A080831 6464376124430434,138181652330967287,3111035191655067585,73576818170267997096,1823567097183804766897,47261433984395105921195
%N A080831 Expansion of e.g.f. exp(tan(exp(x)-1)).
%t A080831 CoefficientList[Series[Exp[Tan[Exp[x] - 1]], {x, 0, 20}], x]*Table[n!, {n, 0, 20}]
%o A080831 (PARI) my(x='x+O('x^30)); Vec(serlaplace(exp(tan(exp(x)-1)))) \\ _Michel Marcus_, Jun 23 2025
%K A080831 easy,nonn
%O A080831 0,3
%A A080831 _Emanuele Munarini_, Mar 28 2003
%E A080831 More terms from _Michel Marcus_, Jun 23 2025