a(n) = 2*n*(2*n^2 + 1).

Terms

a(0) =0a(1) =6a(2) =36a(3) =114a(4) =264a(5) =510a(6) =876a(7) =1386a(8) =2064a(9) =2934a(10) =4020a(11) =5346a(12) =6936a(13) =8814a(14) =11004a(15) =13530a(16) =16416a(17) =19686a(18) =23364a(19) =27474a(20) =32040a(21) =37086a(22) =42636a(23) =48714a(24) =55344a(25) =62550a(26) =70356a(27) =78786a(28) =87864a(29) =97614