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 A170964 #14 Jan 03 2021 21:10:50
%S A170964 1,0,0,1,0,0,0,1,0,0,1,1,0,0,1,1,0,0,2,1,0,1,2,1,0,1,3,1,0,2,3,1,0,3,
%T A170964 4,1,1,4,4,1,1,5,5,1,2,7,5,0,3,8,5,0,5,10,4,1,6,11,4,1,9,12,3,2,11,12,
%U A170964 3,3,14,13,2,5,16,12,2,7,19,12,2,10,20,11,2,12,23,10,2,16,23,8,3,19,24,7,5
%N A170964 Expansion of Product_{i=1..m} (1 + x^(4*i-1)) for m = 11.
%C A170964 Product_{i=1..m} (1 + x^(4*i-1)) is the Poincaré polynomial for both Sp(2m) and O(2m+1).
%D A170964 H. Weyl, The Classical Groups, Princeton, 1946, see p. 238.
%H A170964 Nathaniel Johnston, <a href="/A170964/b170964.txt">Table of n, a(n) for n = 0..253</a> (full sequence)
%F A170964 a(n) = a(253-n). - _Rick L. Shepherd_, Mar 01 2013
%t A170964 CoefficientList[Series[Product[1+x^(4k-1),{k,11}],{x,0,100}],x] (* _Harvey P. Dale_, Sep 19 2020 *)
%Y A170964 Cf. A000700, A147599, A169975, A170956-A170965.
%K A170964 nonn,fini,full,easy
%O A170964 0,19
%A A170964 _N. J. A. Sloane_, Aug 29 2010