a(n) = n*(8*n-5).

Terms

a(0) =0a(1) =3a(2) =22a(3) =57a(4) =108a(5) =175a(6) =258a(7) =357a(8) =472a(9) =603a(10) =750a(11) =913a(12) =1092a(13) =1287a(14) =1498a(15) =1725a(16) =1968a(17) =2227a(18) =2502a(19) =2793a(20) =3100a(21) =3423a(22) =3762a(23) =4117a(24) =4488a(25) =4875a(26) =5278a(27) =5697a(28) =6132a(29) =6583