a(n) = (4*n-1)*4*n*(4*n+1).

Terms

a(0) =0a(1) =60a(2) =504a(3) =1716a(4) =4080a(5) =7980a(6) =13800a(7) =21924a(8) =32736a(9) =46620a(10) =63960a(11) =85140a(12) =110544a(13) =140556a(14) =175560a(15) =215940a(16) =262080a(17) =314364a(18) =373176a(19) =438900a(20) =511920a(21) =592620a(22) =681384a(23) =778596a(24) =884640a(25) =999900a(26) =1124760a(27) =1259604a(28) =1404816a(29) =1560780