a(n) = floor(Pi^n + e^n).

Terms

a(0) =2a(1) =5a(2) =17a(3) =51a(4) =152a(5) =454a(6) =1364a(7) =4116a(8) =12469a(9) =37912a(10) =115674a(11) =354078a(12) =1087023a(13) =3346090a(14) =10324775a(15) =31927163a(16) =98918331a(17) =306999516a(18) =954242372a(19) =2970046250a(20) =9255121991a(21) =28870447577a(22) =90140917038a(23) =281668510339a(24) =880762642043