Number of ways of writing n as a sum of 16 squares.

Terms

a(0) =1a(1) =32a(2) =480a(3) =4480a(4) =29152a(5) =140736a(6) =525952a(7) =1580800a(8) =3994080a(9) =8945824a(10) =18626112a(11) =36714624a(12) =67978880a(13) =118156480a(14) =197120256a(15) =321692928a(16) =509145568a(17) =772845120a(18) =1143441760a(19) =1681379200a(20) =2428524096a(21) =3392205824a(22) =4658843520a(23) =6411152640