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 A144821 #9 Mar 24 2015 20:15:02
%S A144821 1,1,9,81,765,6885,62613,563517,5077569,45701037,411364413,3702279717,
%T A144821 33321067929,299889611361,2699011010385,24291099589185,
%U A144821 218619937132623,1967579434193607,17708215277809323,159373937500283907
%N A144821 Shifts left when Dirichlet convolution with a (DC:(b,a)->c) applied 8 times.
%H A144821 Alois P. Heinz, <a href="/A144821/b144821.txt">Table of n, a(n) for n = 1..1000</a>
%H A144821 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%p A144821 with(numtheory): dc:= proc(b,c) proc(n) option remember; add(b(d) *c(n/d), d=`if`(n<0,{},divisors(n))) end end: A:= proc(n, k) local a, b, t; b[1]:= dc(a,a); for t from 2 to k do b[t]:= dc(b[t-1],a) od: a:= n-> `if`(n=1, 1, b[k](n-1)); a(n) end: a:= n-> A(n,8): seq(a(n), n=1..30);
%Y A144821 8th column of A144823.
%K A144821 eigen,nonn
%O A144821 1,3
%A A144821 _Alois P. Heinz_, Sep 21 2008