Inverse of number triangle A(n,k) = 1/(2*2^n-1) if k <= n <= 2k, 0 otherwise.

Terms

a(0) =1a(1) =0a(2) =3a(3) =0a(4) =-3a(5) =7a(6) =0a(7) =3a(8) =-7a(9) =15a(10) =0a(11) =0a(12) =0a(13) =-15a(14) =31a(15) =0a(16) =-3a(17) =7a(18) =0a(19) =-31a(20) =63a(21) =0a(22) =0a(23) =0a(24) =0a(25) =0a(26) =-63a(27) =127a(28) =0a(29) =3