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 A077633 #4 Oct 15 2013 22:31:40
%S A077633 1,2,4,6,30,14,462,30,924,62,360,126,88623545610600,254,5364840,510,
%T A077633 214057116,1022,473045752778491241949600,2046,
%U A077633 3968969477588889464597306400,4094,16579321550270765937400453704000
%N A077633 LCM of terms in periodic part of continued fraction expansion of square root of -1+2^n.
%t A077633 Table[Apply[LCM, Last[ContinuedFraction[Sqrt[ -1+2^u]]]], {u, 1, 25}]
%Y A077633 Cf. A077624-A077635.
%K A077633 nonn
%O A077633 1,2
%A A077633 _Labos Elemer_, Nov 13 2002