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 A173606 #2 Mar 30 2012 19:00:22 %S A173606 1,2,6,60,55440 %N A173606 a(1) = 1, for n >= 2; a(n) = the smallest number h such that tau(h) = A000005(h) = 2 * a(n-1). %C A173606 The next term is too large to include. %F A173606 A000005(a(n)) = 2 * a(n-1) for n >= 2. %Y A173606 Cf. A014221, A173603, A173604, A173605, A173607, A173608, A173609, A171959, A173011. %K A173606 nonn %O A173606 1,2 %A A173606 _Jaroslav Krizek_, Nov 06 2010