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

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =24a(5) =112a(6) =544a(7) =2368a(8) =9328a(9) =34802a(10) =129064a(11) =491768a(12) =1938336a(13) =7801744a(14) =31553344a(15) =127083328a(16) =509145568a(17) =2035437440a(18) =8148505828a(19) =32728127192a(20) =131880275664a(21) =532597541344