Number of points in Z^n of norm <= 9.

Terms

a(0) =1a(1) =19a(2) =253a(3) =3071a(4) =32633a(5) =313259a(6) =2787125a(7) =23120727a(8) =179773681a(9) =1318315075a(10) =9183188589a(11) =61157195951a(12) =390820296297