a(n) = n^9 * Sum_{d^2|n} 1 / d^9.

Terms

a(0) =1a(1) =512a(2) =19683a(3) =262656a(4) =1953125a(5) =10077696a(6) =40353607a(7) =134479872a(8) =387440172a(9) =1000000000a(10) =2357947691a(11) =5169858048a(12) =10604499373a(13) =20661046784a(14) =38443359375a(15) =68853956608a(16) =118587876497a(17) =198369368064a(18) =322687697779a(19) =513000000000a(20) =794280046581