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 A131387 #10 Aug 09 2015 23:38:12
%S A131387 1,1,1,1,2,4,12,48,48,192,2880,2880,25920,552960,3265920,1935360,
%T A131387 116121600,278691840,9405849600,26754416640,94058496000,3210529996800,
%U A131387 869100503040000,423789959577600,927040536576000,135612787064832000
%N A131387 Product of the nonzero digital products of n for all the bases 1 to n (a 'total digital-product factorial').
%F A131387 a(n)=product{1<=p<=n, dp_p(n)} where dp_p(n) = product of the nonzero digits of n in base p.
%F A131387 Cf. A131385, A010786, A007954.
%o A131387 (PARI) a(n) = {p = 1; for (b=2, n, digs = digits(n, b); p *= prod(k=1, #digs, if (digs[k], digs[k], 1));); return (p);} \\ _Michel Marcus_, Jul 15 2013
%K A131387 nonn,base
%O A131387 1,5
%A A131387 _Hieronymus Fischer_, Jul 08 2007