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 A038576 #9 Aug 11 2014 22:45:17
%S A038576 1,2,5,12,53,118,761,3162,19733,82094,840673,3444786,42178105,
%T A038576 256513416,2094285433,17010796880,274267035513,1662613009958,
%U A038576 30201301214757,243273022728014,2949477573950925,29738048762237264,657186550343170733,5287230451507603128
%N A038576 CONTINUANT transform of {phi(n)}, 1, 1, 2, 2, 4, 2, .. (A002088).
%H A038576 Alois P. Heinz, <a href="/A038576/b038576.txt">Table of n, a(n) for n = 1..200</a>
%H A038576 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%p A038576 with(numtheory):
%p A038576 a:= proc(n) option remember; `if`(n<0, 0,
%p A038576 `if`(n=0, 1, phi(n) *a(n-1) +a(n-2)))
%p A038576 end:
%p A038576 seq(a(n), n=1..30); # _Alois P. Heinz_, Aug 17 2013
%Y A038576 Cf. A002088.
%K A038576 nonn
%O A038576 1,2
%A A038576 _N. J. A. Sloane_, Jun 11 2002