17 times triangular numbers.

Terms

a(0) =0a(1) =17a(2) =51a(3) =102a(4) =170a(5) =255a(6) =357a(7) =476a(8) =612a(9) =765a(10) =935a(11) =1122a(12) =1326a(13) =1547a(14) =1785a(15) =2040a(16) =2312a(17) =2601a(18) =2907a(19) =3230a(20) =3570a(21) =3927a(22) =4301a(23) =4692a(24) =5100a(25) =5525a(26) =5967a(27) =6426a(28) =6902a(29) =7395