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 A221177 #17 Feb 08 2019 04:21:11
%S A221177 1,2,9,1777,63435145,623666451641641,2670266572530016805342641,
%T A221177 7363629673367015952858629874317363281,
%U A221177 18165725639381578540715992641519758891553446152650241,53130688923813417393347555772148839841537612656804852891837024804533761
%N A221177 Row sums of A141906.
%H A221177 Alois P. Heinz, <a href="/A221177/b221177.txt">Table of n, a(n) for n = 0..20</a>
%F A221177 a(n) ~ n^(n^2 - n/2 + 1) / (exp(1/12) * (2*Pi)^((n-1)/2)). - _Vaclav Kotesovec_, Feb 08 2019
%p A221177 a:= n-> add((n*m)!/m!^n, m=0..n):
%p A221177 seq(a(n), n=0..10); # _Alois P. Heinz_, Jan 09 2013
%t A221177 a[n_] := Sum[(n*m)!/m!^n, {m, 0, n}]; Array[a, 10, 0] (* _Jean-François Alcover_, Feb 17 2016 *)
%o A221177 (PARI) a(n) = sum(m=0, n, (n*m)!/(m!)^n); \\ _Michel Marcus_, Feb 17 2016
%Y A221177 Cf. A141906.
%K A221177 nonn
%O A221177 0,2
%A A221177 _N. J. A. Sloane_, Jan 05 2013