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 A144319 #4 Mar 30 2012 17:37:28
%S A144319 1,1,32,1024,33264,1064448,34094080,1091010560,34913358688,
%T A144319 1117227985920,35751328547328,1144042513514496,36609361521378304,
%U A144319 1171499568684105728,37487986231712710656,1199615559415862673408
%N A144319 Shifts left when Dirichlet convolution (DC:(b,b)->a) applied 5 times.
%H A144319 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%p A144319 k:=5: 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:='a': b[1]:= dc(a,a): for t from 2 to k do b[t]:= dc(b[t-1], b[t-1]) od: a:= n-> `if`(n=1, 1, b[k](n-1)): seq (a(n), n=1..25);
%Y A144319 5th column of A144324.
%K A144319 eigen,nonn
%O A144319 1,3
%A A144319 _Alois P. Heinz_, Sep 17 2008