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

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =2a(5) =3a(6) =0a(7) =0a(8) =12a(9) =21a(10) =0a(11) =0a(12) =113a(13) =202a(14) =0a(15) =0a(16) =1218a(17) =2241a(18) =0a(19) =0a(20) =14326a(21) =26776a(22) =0a(23) =0a(24) =177714a(25) =335607a(26) =0a(27) =0a(28) =2287975a(29) =4353975