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 A105863 #5 Oct 26 2019 16:55:23
%S A105863 1,6,12,44,30,252,56,856,846,3080,132,20616,182,49532,52110,237232,
%T A105863 306,1227096,380,4106320,2470272,15525092,552,86092176,1328900,
%U A105863 270424752,126624006,1157002616,870,5577100260,992,19572325728,6386892930
%N A105863 a(n) = n * Sum_{d|n} (binomial(n,d) / gcd(n,d)).
%F A105863 a(n) = n * A056045(n) = n * Sum_{d|n} (binomial(n, d) / gcd(n, d)).
%t A105863 f[n_] := Block[{d = Divisors[n]}, n*Plus @@ (Binomial[n, d])]; Table[ f[n], {n, 34}]
%Y A105863 Cf. A056045, A105861, A105862.
%K A105863 nonn
%O A105863 1,2
%A A105863 _Robert G. Wilson v_, Apr 23 2005