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a(n) = floor(Pi^n / e).
0

%I #9 Aug 28 2021 18:23:14

%S 0,1,3,11,35,112,353,1111,3490,10966,34451,108231,340019,1068203,

%T 3355859,10542742,33121003,104052699,326891197,1026958985,3226286805,

%U 10135678925,31842174452,100035141333,314269665113,987307271166

%N a(n) = floor(Pi^n / e).

%t Floor[Pi^Range[0,30]/E] (* _Harvey P. Dale_, Aug 28 2021 *)

%K nonn,easy

%O 0,3

%A _Patrick De Geest_, May 15 1998