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

Terms

a(0) =1a(1) =10a(2) =46a(3) =130a(4) =265a(5) =463a(6) =799a(7) =1339a(8) =2014a(9) =2780a(10) =3860a(11) =5444a(12) =7301a(13) =9263a(14) =11783a(15) =15263a(16) =19250a(17) =23237a(18) =27893a(19) =34193a(20) =41519a(21) =48701a(22) =56765a(23) =67421a(24) =79484a(25) =91067a(26) =103739a(27) =119855a(28) =138035a(29) =155819