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

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =3a(9) =3a(10) =4a(11) =4a(12) =5a(13) =6a(14) =7a(15) =8a(16) =10a(17) =11a(18) =13a(19) =15a(20) =18a(21) =20a(22) =24a(23) =27a(24) =32a(25) =37a(26) =43a(27) =49a(28) =57a(29) =66