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

Terms

a(0) =1a(1) =7a(2) =63a(3) =337a(4) =1319a(5) =3819a(6) =9763a(7) =21374a(8) =43774a(9) =81586a(10) =145138a(11) =243345a(12) =394696a(13) =612274a(14) =928616a(15) =1363401a(16) =1967428a(17) =2762729a(18) =3825273a(19) =5197436a(20) =6974412a(21) =9198648a(22) =12019669a(23) =15500750a(24) =19827441a(25) =25050955a(26) =31438147a(27) =39053729a(28) =48254762