a(n) = floor((1 + 1/Pi)^n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =3a(5) =5a(6) =6a(7) =9a(8) =12a(9) =15a(10) =20a(11) =27a(12) =36a(13) =47a(14) =63a(15) =83a(16) =109a(17) =144a(18) =190a(19) =251a(20) =331a(21) =436a(22) =575a(23) =759a(24) =1001a(25) =1319a(26) =1739a(27) =2293a(28) =3023a(29) =3985