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 A068033 #6 Sep 08 2022 13:31:22
%S A068033 1,1,1,1,1,3,6,11,22,44,86,172,344,684,1368,2736,5464,10928,21856,
%T A068033 43696,87392,174784,349536,699072,1398144,2796224,5592448,11184896,
%U A068033 22369664,44739328,89478656,178957056,357914112,715828224,1431655936
%N A068033 Number of subsets of {1,2,3,...,n} that sum to 0 mod 12.
%F A068033 Empirical G.f.: -(2*x^8-x^7-2*x^6-3*x^5-x^4+3*x^3+x^2+x-1) / ((2*x-1)*(2*x^3-1)). [_Colin Barker_, Dec 22 2012]
%Y A068033 12th row of A068009.
%K A068033 nonn
%O A068033 0,6
%A A068033 _Antti Karttunen_, Feb 11 2002