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 A318476 #7 Aug 30 2018 08:34:04 %S A318476 1,2,2,4,2,4,2,32,4,4,2,8,2,4,4,16384,2,8,2,8,4,4,2,64,4,4,32,8,2,8,2, %T A318476 4398046511104,4,4,4,16,2,4,4,64,2,8,2,8,8,4,2,32768,4,8,4,8,2,64,4, %U A318476 64,4,4,2,16,2,4,8,5444517870735015415413993718908291383296,4,8,2,8,4,8,2,128,2,4,8,8,4,8,2,32768,16384,4,2,16,4,4,4,64,2,16,4,8,4,4,4 %N A318476 Multiplicative with a(p^e) = 2^A000108(e). %H A318476 Antti Karttunen, <a href="/A318476/b318476.txt">Table of n, a(n) for n = 1..511</a> %H A318476 <a href="/index/Eu#epf">Index entries for sequences computed from exponents in factorization of n</a> %F A318476 a(n) = 2^A318475(n). %o A318476 (PARI) %o A318476 A000108(n) = (binomial(2*n, n)/(n+1)); %o A318476 A318476(n) = factorback(apply(e -> 2^A000108(e),factor(n)[,2])); %Y A318476 Cf. A000108, A318475. %Y A318476 Cf. also A069739. %K A318476 nonn,mult %O A318476 1,2 %A A318476 _Antti Karttunen_, Aug 29 2018