Least sum of 4 nonzero squares in exactly n ways.

Terms

a(0) =0a(1) =4a(2) =31a(3) =28a(4) =52a(5) =82a(6) =90a(7) =135a(8) =130a(9) =162a(10) =198a(11) =202a(12) =252a(13) =234a(14) =210a(15) =346a(16) =306a(17) =322a(18) =423a(19) =370a(20) =330a(21) =418a(22) =390a(23) =462a(24) =378a(25) =490a(26) =598a(27) =450a(28) =546a(29) =618