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

Terms

a(0) =0a(1) =13a(2) =42a(3) =87a(4) =148a(5) =225a(6) =318a(7) =427a(8) =552a(9) =693a(10) =850a(11) =1023a(12) =1212a(13) =1417a(14) =1638a(15) =1875a(16) =2128a(17) =2397a(18) =2682a(19) =2983a(20) =3300a(21) =3633a(22) =3982a(23) =4347a(24) =4728a(25) =5125a(26) =5538a(27) =5967a(28) =6412a(29) =6873