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 A170958 #10 Jan 05 2021 02:39:35
%S A170958 1,0,0,1,0,0,0,1,0,0,1,1,0,0,1,1,0,0,2,1,0,1,2,0,0,1,2,0,0,2,1,0,0,2,
%T A170958 1,0,1,2,0,0,1,1,0,0,1,1,0,0,1,0,0,0,1,0,0,1
%N A170958 Expansion of Product_{i=1..m} (1 + x^(4*i-1)) for m = 5.
%C A170958 Product_{i=1..m} (1 + x^(4*i-1)) is the Poincaré polynomial for both Sp(2m) and O(2m+1).
%D A170958 H. Weyl, The Classical Groups, Princeton, 1946, see p. 238.
%t A170958 CoefficientList[Series[Product[1+x^(4i-1),{i,5}],{x,0,60}],x] (* _Harvey P. Dale_, Mar 09 2019 *)
%Y A170958 Cf. A000700, A147599, A169975, A170956-A170965.
%K A170958 nonn,fini,full
%O A170958 0,19
%A A170958 _N. J. A. Sloane_, Aug 29 2010