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

Terms

a(0) =1a(1) =46a(2) =760a(3) =7751a(4) =43910a(5) =186098a(6) =652710a(7) =1943742a(8) =5178030a(9) =12411211a(10) =27773308a(11) =57798904a(12) =114152429a(13) =214399664a(14) =387571706a(15) =673189698a(16) =1135916808a(17) =1857320784a(18) =2966816950a(19) =4623984661a(20) =7066527283a(21) =10577150039a(22) =15589368584a(23) =22580091614a(24) =32256768126