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 A352606 #8 Mar 23 2022 13:01:27
%S A352606 0,-1,1,-31,421,-19531,873841,-67417351,6079224061,-745862759491,
%T A352606 109749390119881,-20006355219508351,4313763491717212501,
%U A352606 -1101230418170874812731,326019382476444960095521,-111246859639685180908387831,43247270290320815515213664941
%N A352606 Expansion of e.g.f. tan(cos(x) - 1) (even part).
%o A352606 (PARI) my(N=40, x='x+O('x^N)); v=Vec(serlaplace(tan(cos(x)-1))); concat(0, vector(#v\2, k, v[2*k-1]))
%Y A352606 Cf. A000182, A003705, A192007, A192060.
%K A352606 sign
%O A352606 0,4
%A A352606 _Seiichi Manyama_, Mar 23 2022