Number of integer solutions to (x_1)^2 + (x_2)^2 + ... + (x_9)^2 <= n.

Terms

a(0) =1a(1) =19a(2) =163a(3) =835a(4) =2869a(5) =7189a(6) =14581a(7) =27253a(8) =49861a(9) =84663a(10) =129303a(11) =190071a(12) =284055a(13) =409335a(14) =550455a(15) =732855a(16) =995241a(17) =1312617a(18) =1656153a(19) =2077497a(20) =2634777a(21) =3300057a(22) =4003641a(23) =4804281a(24) =5872665a(25) =7129227a(26) =8363307a(27) =9784491a(28) =11635755a(29) =13670475