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 A309564 #7 Aug 09 2019 02:52:24 %S A309564 1,1,1,1,-1,1,-1,3,-15,59,-189,567,-1863,7141,-29817,125919,-528329, %T A309564 2238303,-9769917,44312225,-208177669,1005840685,-4972561375, %U A309564 25105651267,-129470605611,682486916465,-3678964401327,20276967904907,-114199064797229,656666370592173 %N A309564 Shifts left by 3 places under series reversion. %C A309564 Series reversion of the g.f. gives the same sequence with three initial terms (1, 1, 1) dropped. %F A309564 G.f. satisfies A((A(x) - x - x^2 - x^3)/x^3) = x. %t A309564 Nest[InverseSeries[#] x^3 + x^3 + x^2 + x &, x + O[x]^2, 10][[3]] %Y A309564 Cf. A067145, A309254. %K A309564 sign %O A309564 1,8 %A A309564 _Vladimir Reshetnikov_, Aug 08 2019