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 A130706 #20 Dec 31 2023 10:16:53 %S A130706 1,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %T A130706 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, %U A130706 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 %N A130706 a(0) = 1, a(1) = 2, a(n) = 0 for n > 1. %C A130706 Inverse binomial transform of A005408. %C A130706 Decimal expansion of 3/25. - _Franklin T. Adams-Watters_, Mar 08 2019 %C A130706 2^n mod 4. - _Charles R Greathouse IV_, Apr 30 2019 %F A130706 G.f.: 1 + 2*x. %t A130706 RealDigits[12, 10, 100][[1]] (* _Alonso del Arte_, Sep 16 2016 *) %o A130706 (PARI) .12 \\ _Charles R Greathouse IV_, Sep 16 2016 %K A130706 easy,nonn %O A130706 0,2 %A A130706 _Philippe Deléham_, Jun 27 2007