%I #6 May 07 2018 12:10:15
%S 1,3,10,42,212,1274,8924,71398,642586,6425860,70684467,848213615,
%T 11026777001,154374878018,2315623170283,37049970724531,
%U 629849502317038,11337291041706700,215408529792427309,4308170595848546191
%N [ exp(4/7)*n! ].
%t Floor[Exp[4/7]Range[20]!] (* _Harvey P. Dale_, May 07 2018 *)
%K nonn
%O 1,2
%A _Simon Plouffe_