Number of subsets of the interval [-n .. +n] with sums > 0.

Terms

a(0) =0a(1) =2a(2) =12a(3) =54a(4) =230a(5) =948a(6) =3860a(7) =15624a(8) =63014a(9) =253588a(10) =1019072a(11) =4091174a(12) =16412668a(13) =65808044a(14) =263755984a(15) =1056789662a(16) =4233176854a(17) =16953418148a(18) =67885557896a(19) =271793651816