a(n) = n * (10*n^2 - 6n + 1) = n * A087348(n).

Terms

a(0) =0a(1) =5a(2) =58a(3) =219a(4) =548a(5) =1105a(6) =1950a(7) =3143a(8) =4744a(9) =6813a(10) =9410a(11) =12595a(12) =16428a(13) =20969a(14) =26278a(15) =32415a(16) =39440a(17) =47413a(18) =56394a(19) =66443a(20) =77620a(21) =89985a(22) =103598a(23) =118519a(24) =134808a(25) =152525a(26) =171730a(27) =192483a(28) =214844a(29) =238873