a(n) = (6*n)^5.

Terms

a(0) =0a(1) =7776a(2) =248832a(3) =1889568a(4) =7962624a(5) =24300000a(6) =60466176a(7) =130691232a(8) =254803968a(9) =459165024a(10) =777600000a(11) =1252332576a(12) =1934917632a(13) =2887174368a(14) =4182119424a(15) =5904900000a(16) =8153726976a(17) =11040808032a(18) =14693280768a(19) =19254145824a(20) =24883200000a(21) =31757969376a(22) =40074642432a(23) =50049003168a(24) =61917364224