a(n) = (10*n + 1)^6.

Terms

a(0) =1a(1) =1771561a(2) =85766121a(3) =887503681a(4) =4750104241a(5) =17596287801a(6) =51520374361a(7) =128100283921a(8) =282429536481a(9) =567869252041