%I #11 Aug 01 2017 04:37:39

%S 0,0,2,6,17,47,128,349,948,2579,7011,19058,51806,140824,382800,

%T 1040560,2828536,7688760,20900217,56812680,154432878,419792086,

%U 1141113200,3101867275,8431749450,22919871312,62302669700,169356214910,460357921527

%N a(n) = floor( exp(n) / Pi ).

%t Floor[E^Range[0,30]/Pi] (* _Harvey P. Dale_, May 02 2014 *)

%K nonn,easy

%O 0,3

%A _Patrick De Geest_, May 15 1998