a(n) = (12*n)^5.

Terms

a(0) =0a(1) =248832a(2) =7962624a(3) =60466176a(4) =254803968a(5) =777600000a(6) =1934917632a(7) =4182119424a(8) =8153726976a(9) =14693280768a(10) =24883200000a(11) =40074642432a(12) =61917364224a(13) =92389579776a(14) =133827821568a(15) =188956800000a(16) =260919263232a(17) =353305857024a(18) =470184984576a(19) =616132666368a(20) =796262400000