a(n) = numerator(Integral_{(x,y,z) in R^3 : 0 <= x^2 + y^2 + z^2 <= n^2} (x^2 + y^2) dx dy dz)/Pi.

Terms

a(0) =0a(1) =8a(2) =256a(3) =648a(4) =8192a(5) =5000a(6) =20736a(7) =134456a(8) =262144a(9) =157464a(10) =160000a(11) =1288408a(12) =663552a(13) =2970344a(14) =4302592a(15) =405000a(16) =8388608a(17) =11358856a(18) =5038848a(19) =19808792a(20) =5120000a(21) =10890936a(22) =41229056a(23) =51490744a(24) =21233664a(25) =15625000a(26) =95051008a(27) =38263752a(28) =137682944a(29) =164089192