a(n) = 12*n + 8.

Terms

a(0) =8a(1) =20a(2) =32a(3) =44a(4) =56a(5) =68a(6) =80a(7) =92a(8) =104a(9) =116a(10) =128a(11) =140a(12) =152a(13) =164a(14) =176a(15) =188a(16) =200a(17) =212a(18) =224a(19) =236a(20) =248a(21) =260a(22) =272a(23) =284a(24) =296a(25) =308a(26) =320a(27) =332a(28) =344a(29) =356