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 A171900 #16 Jun 24 2021 07:20:53 %S A171900 0,0,1,3,2,2,1,3,1,3,1,3,2,2,1,3,2,2,1,3,2,2,1,3,1,3,1,3,2,2,1,3,1,3, %T A171900 1,3,2,2,1,3,1,3,1,3,2,2,1,3,2,2,1,3,2,2,1,3,1,3,1,3,2,2,1,3,2,2,1,3, %U A171900 2,2,1,3,1,3,1,3,2,2,1,3,2,2,1,3,2,2,1,3,1,3,1,3,2,2,1,3,1,3,1,3,2,2,1,3,1 %N A171900 Backwards van Eck transform of A010060. %C A171900 See A171898 for definition. This assumes the offset of A010060 is taken to be 1. %C A171900 A161916 gives the forwards van Eck transform of A010060. %C A171900 Since A001285(n) = 1+A010060(n) differ only by a constant, this is also the Backwards van Eck Transform of A001285. - _R. J. Mathar_, Jun 24 2021 %F A171900 A026491(n-1)-A026491(n-2) = a(n) for n>=3. - _Michel Dekking_, Apr 11 2019 %Y A171900 Cf. A010060, A161916, A171898. See also A026491. %K A171900 nonn %O A171900 1,4 %A A171900 _N. J. A. Sloane_, Oct 22 2010