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 A030275 #12 Jul 08 2025 19:32:45
%S A030275 1,1,2,4,8,1,16,64,128,128,256,512,1024,2048,2048,16384,32768,32768,
%T A030275 65536,131072,262144,131072,524288,2097152,4194304,4194304,8388608,
%U A030275 2097152,16777216,134217728,67108864,1073741824,2147483648,2147483648,4294967296,8589934592
%N A030275 Denominators of sequence {b(1), b(2),...} which when COMPOSED with itself gives {1,2,3,...}.
%H A030275 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%e A030275 [ 1, 1, 1/2, 1/4, 1/8, 0, 1/16, 3/64, -29/128, 25/128, 263/256, -1481/512, -5493/1024, 80505/2048 ]
%Y A030275 Cf. A030274, A091138.
%K A030275 nonn,frac
%O A030275 1,3
%A A030275 _N. J. A. Sloane_
%E A030275 More terms from _Vladeta Jovovic_, Dec 19 2003