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 A171933 #9 Jun 20 2019 09:12:49 %S A171933 0,0,1,0,2,2,0,2,4,0,4,2,4,6,0,2,0,6,4,0,4,11,0,11,0,0,2,12,6,11,0,12, %T A171933 4,16,14,9,0,16,0,0,0,0,12,0,6,11,14,24,8,0,2,16,0,24,29,0,29,24,0,0, %U A171933 23,4,16,32,9,29,12,6,26,11,0,24,0,11,2,32,9,38,14,11,0,29,41,38,40,0,8,24,11 %N A171933 Backwards van Eck transform of A171922. %C A171933 The forwards van Eck transform of A171922 is A171922 shifted right by one place. %H A171933 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %Y A171933 Cf. A171922. %K A171933 nonn %O A171933 1,5 %A A171933 _N. J. A. Sloane_, Oct 24 2010