a(n) = prime(n)*prime(n-1) + 1.

Terms

a(0) =3a(1) =7a(2) =16a(3) =36a(4) =78a(5) =144a(6) =222a(7) =324a(8) =438a(9) =668a(10) =900a(11) =1148a(12) =1518a(13) =1764a(14) =2022a(15) =2492a(16) =3128a(17) =3600a(18) =4088a(19) =4758a(20) =5184a(21) =5768a(22) =6558a(23) =7388a(24) =8634a(25) =9798a(26) =10404a(27) =11022a(28) =11664a(29) =12318