Number of ways of writing n as a sum of 13 squares.

Terms

a(0) =1a(1) =26a(2) =312a(3) =2288a(4) =11466a(5) =41808a(6) =116688a(7) =265408a(8) =535704a(9) =1031914a(10) =1899664a(11) =3214224a(12) =5043376a(13) =7801744a(14) =12066912a(15) =17689152a(16) =24443978a(17) =34039200a(18) =48210760a(19) =64966096a(20) =83323344a(21) =109157152a(22) =145532816a(23) =185245632a(24) =227110416a(25) =284788010a(26) =363737712