a(n) = Sum_{0<d|n, n/d odd} d^9.

Terms

a(0) =1a(1) =512a(2) =19684a(3) =262144a(4) =1953126a(5) =10078208a(6) =40353608a(7) =134217728a(8) =387440173a(9) =1000000512a(10) =2357947692a(11) =5160042496a(12) =10604499374a(13) =20661047296a(14) =38445332184a(15) =68719476736a(16) =118587876498a(17) =198369368576a(18) =322687697780a(19) =512000262144