Number of points in Z^6 of norm <= n.

Terms

a(0) =1a(1) =13a(2) =485a(3) =4197a(4) =23793a(5) =84769a(6) =252673a(7) =622573a(8) =1395261a(9) =2787125a(10) =5260181a(11) =9249417a(12) =15637897a(13) =25112577a(14) =39258381a(15) =59174749a(16) =87380293a(17) =125264525a(18) =176663297a(19) =244000537a(20) =332379769a(21) =444344469a(22) =587923621a(23) =766764301a(24) =990981473