Number of solutions to 1 +- 5 +- 12 +- ... +- n*(3*n-1)/2 = 0.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =2a(8) =0a(9) =1a(10) =2a(11) =2a(12) =0a(13) =15a(14) =23a(15) =39a(16) =0a(17) =105a(18) =183a(19) =322a(20) =0a(21) =1016a(22) =1848a(23) =3347a(24) =0a(25) =10968a(26) =19943a(27) =36549a(28) =0a(29) =123086