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

Terms

a(0) =0a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =5a(18) =0a(19) =0a(20) =0a(21) =0a(22) =21a(23) =0a(24) =0a(25) =126a(26) =0a(27) =0a(28) =0a(29) =0