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 A321205 #9 Nov 09 2018 21:53:45
%S A321205 1,-1,0,0,2,0,-5,-7,14,42,-12,-198,-165,715,1573,-1573,-9282,-3094,
%T A321205 41548,63308,-131784,-468996,111758,2496144,2369851,-9926455,
%U A321205 -23864570,22785180,150243015,60480225,-709314480,-1161220320,2325542190,8874775170,-1613776920
%N A321205 Alternating row sums of Riordan triangle A319203.
%C A321205 The row sums are given in A321204.
%F A321205 G.f: f(x)/(1 + x*f(x)) where f(x) = F^([-1])(x)/x with F^{[-1]}(y) the compositional inverse of F(x) = x/(1 - x^2 - x^3). The expansion of f is given in A319201.
%Y A321205 Cf. A319201, A319203, A321204.
%K A321205 sign,easy
%O A321205 0,5
%A A321205 _Wolfdieter Lang_, Nov 09 2018