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 A170966 #5 Jan 03 2021 21:12:46
%S A170966 1,1,0,0,0,1,1,0,0,1,1,0,0,0,1,1
%N A170966 Expansion of Product_{i=0..m-1} (1 + x^(4*i+1)) for m = 3.
%Y A170966 Cf. A169975, A170966-A170984.
%K A170966 nonn,fini,full
%O A170966 0,1
%A A170966 _N. J. A. Sloane_, Aug 29 2010