Number of integer solutions to (x_1)^2 + (x_2)^2 + ... + (x_10)^2 <= n.

Terms

a(0) =1a(1) =21a(2) =201a(3) =1161a(4) =4541a(5) =12965a(6) =29285a(7) =58085a(8) =110105a(9) =198765a(10) =327829a(11) =503509a(12) =765589a(13) =1152509a(14) =1642109a(15) =2243069a(16) =3083569a(17) =4221529a(18) =5551949a(19) =7115789a(20) =9166133a(21) =11777333a(22) =14763893a(23) =18121973a(24) =22316213a(25) =27634481a(26) =33512921a(27) =39812441a(28) =47674841a(29) =57294401