Number of ways to write 2*n as an ordered sum of n squares of positive integers.

Terms

a(0) =1a(1) =0a(2) =0a(3) =3a(4) =0a(5) =0a(6) =15a(7) =0a(8) =8a(9) =84a(10) =0a(11) =110a(12) =495a(13) =0a(14) =1092a(15) =3018a(16) =120a(17) =9520a(18) =18870a(19) =2907a(20) =77520a(21) =120270a(22) =43890a(23) =606188a(24) =780023a(25) =531300a(26) =4620200a(27) =5161377a(28) =5651100a(29) =34622172