Number of ways of writing n as a sum of 15 squares.

Terms

a(0) =1a(1) =30a(2) =420a(3) =3640a(4) =21870a(5) =96936a(6) =331240a(7) =911040a(8) =2128260a(9) =4495430a(10) =8972712a(11) =16946280a(12) =29822520a(13) =49476840a(14) =80027280a(15) =127083328a(16) =193511790a(17) =282611280a(18) =409172940a(19) =590913960a(20) =825736296a(21) =1115671760a(22) =1509537960a(23) =2048372160a(24) =2698852520a(25) =3463029894