Eleven times hexagonal numbers: a(n) = 11*n*(2*n-1).

Terms

a(0) =0a(1) =11a(2) =66a(3) =165a(4) =308a(5) =495a(6) =726a(7) =1001a(8) =1320a(9) =1683a(10) =2090a(11) =2541a(12) =3036a(13) =3575a(14) =4158a(15) =4785a(16) =5456a(17) =6171a(18) =6930a(19) =7733a(20) =8580a(21) =9471a(22) =10406a(23) =11385a(24) =12408a(25) =13475a(26) =14586a(27) =15741a(28) =16940a(29) =18183