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 A066090 #15 Nov 04 2017 04:41:26
%S A066090 1,3,4,35,6,924,8,6435,715,43758,12,30421755,14,1961256,1307504,
%T A066090 300540195,18,62359143990,20,513791607420,129024480,3796297200,24,
%U A066090 36052387482172425,736281,166509721602,12033222880,7648690600760440,30
%N A066090 a(n) = binomial(sigma(n), n).
%H A066090 Harry J. Smith, <a href="/A066090/b066090.txt">Table of n, a(n) for n=1..200</a>
%e A066090 a(4) = binomial(sigma(4),4) = binomial(7,4) = 7!/(4!3!) = 35.
%t A066090 Table[ Binomial[ DivisorSigma[1, n], n], {n, 1, 32} ]
%o A066090 (PARI) { for (n=1, 200, a=binomial(sigma(n), n); write("b066090.txt", n, " ", a) ) } \\ _Harry J. Smith_, Nov 12 2009
%Y A066090 Cf. A066449, A064366.
%K A066090 easy,nonn
%O A066090 1,2
%A A066090 _Joseph L. Pe_, Dec 30 2001
%E A066090 Corrected and extended by _Robert G. Wilson v_, Dec 31 2001