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

Terms

a(0) =1a(1) =5a(2) =34a(3) =201a(4) =1179a(5) =6909a(6) =40488a(7) =237256a(8) =1390293a(9) =8146945a(10) =47740079a(11) =279750872a(12) =1639304997a(13) =9606121523a(14) =56290666385a(15) =329856239532