a(n) = 15*n*(n+1) + 11.

Terms

a(0) =11a(1) =41a(2) =101a(3) =191a(4) =311a(5) =461a(6) =641a(7) =851a(8) =1091a(9) =1361a(10) =1661a(11) =1991a(12) =2351a(13) =2741a(14) =3161a(15) =3611a(16) =4091a(17) =4601a(18) =5141a(19) =5711a(20) =6311a(21) =6941a(22) =7601a(23) =8291a(24) =9011a(25) =9761a(26) =10541a(27) =11351a(28) =12191a(29) =13061