a(n) is the number of odd numbers k < 2^n such that A260590(k) = n.

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =2a(5) =0a(6) =3a(7) =7a(8) =0a(9) =12a(10) =0a(11) =30a(12) =85a(13) =0a(14) =173a(15) =476a(16) =0a(17) =961a(18) =0a(19) =2652a(20) =8045a(21) =0a(22) =17637a(23) =51033a(24) =0a(25) =108950a(26) =312455a(27) =0a(28) =663535a(29) =0