Number of solutions to +- 1 +- 2^2 +- 3^2 +- 4^2 +- ... +- n^2 = 0.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =2a(7) =2a(8) =0a(9) =0a(10) =2a(11) =10a(12) =0a(13) =0a(14) =86a(15) =114a(16) =0a(17) =0a(18) =478a(19) =860a(20) =0a(21) =0a(22) =5808a(23) =10838a(24) =0a(25) =0a(26) =55626a(27) =100426a(28) =0a(29) =0