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 A077635 #9 Sep 17 2021 16:00:40
%S A077635 2,4,10,16,210,52,10764,160,840,484,78225840,1456,5729631692400,4372,
%T A077635 932723933480442148565520,13120,202096081896183783466278120,39364,
%U A077635 1505075187143521116689096930825555405884185492185368021027531191578186233461600
%N A077635 LCM of terms in periodic part of continued fraction expansion of square root of -1+3^n.
%H A077635 Chai Wah Wu, <a href="/A077635/b077635.txt">Table of n, a(n) for n = 1..30</a>
%t A077635 Table[Apply[LCM, Last[ContinuedFraction[Sqrt[ -1+3^u]]]], {u, 1, 25}]
%Y A077635 Cf. A077624-A077635.
%K A077635 nonn
%O A077635 1,1
%A A077635 _Labos Elemer_, Nov 13 2002