Crystal ball sequence for E_8 lattice.

Terms

a(0) =1a(1) =241a(2) =9361a(3) =131041a(4) =996001a(5) =5109841a(6) =20015281a(7) =64495681a(8) =179375041a(9) =444798001a(10) =1006201681a(11) =2111519521a(12) =4162485601a(13) =7783236241a(14) =13909734001a(15) =23903867521a(16) =39696408961a(17) =63963339121a(18) =100340378641a(19) =153680892001