First semiprime after Pi^n.

Terms

a(0) =4a(1) =4a(2) =10a(3) =33a(4) =106a(5) =309a(6) =965a(7) =3022a(8) =9489a(9) =29813a(10) =93649a(11) =294209a(12) =924271a(13) =2903678a(14) =9122173a(15) =28658147a(16) =90032221a(17) =282844574a(18) =888582413a(19) =2791563955a(20) =8769956797a(21) =27551631845a(22) =86556004193a(23) =271923706897a(24) =854273519921