%I #8 Mar 31 2012 10:24:05
%S 1,2,4,11,92,8101,65585702,4301483913318599,
%T 18502763856538658405109886092616,
%U 342352270330833327273885765082712290623512199361069533040982537
%N a(0) = 1; a(n) = n + product_{i=0..n1} a(i), n >= 1.
%C The product of an empty set is 1, so a(0) = 1.
%C 5  (1+1/2+1/4+1/11+1/92) = 3.14822... is close to Pi.
%H Arkadiusz Wesolowski, <a href="/A198864/b198864.txt">Table of n, a(n) for n = 0..14</a>
%F a(n) = n + a(0)*a(1)*...*a(n1).
%t lst = {}; k = m = 1; Do[k = k*m; AppendTo[lst, k + n]; m = k + n, {n, 0, 9}]; lst
%K nonn
%O 0,2
%A _Arkadiusz Wesolowski_, Oct 30 2011
