a(n) = (12*n + 6)^5.

Terms

a(0) =7776a(1) =1889568a(2) =24300000a(3) =130691232a(4) =459165024a(5) =1252332576a(6) =2887174368a(7) =5904900000a(8) =11040808032a(9) =19254145824a(10) =31757969376a(11) =50049003168a(12) =75937500000a(13) =111577100832a(14) =159494694624a(15) =222620278176a(16) =304316815968a(17) =408410100000a(18) =539218609632a(19) =701583371424a(20) =900897818976