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 A014806 #15 Jun 04 2017 02:41:51
%S A014806 1,20,190,1160,5225,18924,58350,158840,391020,886540,1877676,3753640,
%T A014806 7140485,13014240,22846170,38794448,63969485,102744780,161143180,
%U A014806 247386480,372472353,550858280,801535160,1148976360,1624208445,2266848372,3126467670,4264095520
%N A014806 Expansion of Jacobi theta constant (theta_2/2)^20.
%H A014806 Seiichi Manyama, <a href="/A014806/b014806.txt">Table of n, a(n) for n = 0..10000</a>
%F A014806 a(0) = 1, a(n) = (20/n)*Sum_{k=1..n} A002129(k)*a(n-k) for n > 0. - _Seiichi Manyama_, May 06 2017
%Y A014806 Column k=20 of A286180.
%Y A014806 Cf. A002129, A010054.
%K A014806 nonn
%O A014806 0,2
%A A014806 _N. J. A. Sloane_
%E A014806 More terms from _Seiichi Manyama_, May 06 2017