Nonnegative numbers of form n*(n^2+-1)/2.

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =12a(5) =15a(6) =30a(7) =34a(8) =60a(9) =65a(10) =105a(11) =111a(12) =168a(13) =175a(14) =252a(15) =260a(16) =360a(17) =369a(18) =495a(19) =505a(20) =660a(21) =671a(22) =858a(23) =870a(24) =1092a(25) =1105a(26) =1365a(27) =1379a(28) =1680a(29) =1695