Number of ordered ways of writing n as a sum of 4 squares of nonnegative integers.

Terms

a(0) =1a(1) =4a(2) =6a(3) =4a(4) =5a(5) =12a(6) =12a(7) =4a(8) =6a(9) =16a(10) =18a(11) =12a(12) =8a(13) =16a(14) =24a(15) =12a(16) =5a(17) =24a(18) =30a(19) =16a(20) =18a(21) =28a(22) =24a(23) =12a(24) =12a(25) =28a(26) =42a(27) =28a(28) =12a(29) =36