Number of different values of i^2+j^2+k^2+l^2 for i,j,k,l in [ 0,n ].

Terms

a(0) =1a(1) =5a(2) =14a(3) =29a(4) =50a(5) =74a(6) =111a(7) =149a(8) =197a(9) =247a(10) =308a(11) =370a(12) =451a(13) =526a(14) =613a(15) =706a(16) =815a(17) =914a(18) =1037a(19) =1146a(20) =1284a(21) =1416a(22) =1565a(23) =1698a(24) =1876a(25) =2030a(26) =2209a(27) =2380a(28) =2578a(29) =2757