a(k) is the index of the first occurrence of 2*k-1 in A208884, or 0 if it does not occur.

Terms

a(0) =1a(1) =2a(2) =13a(3) =4a(4) =6a(5) =75a(6) =22975a(7) =11a(8) =15a(9) =10a(10) =1417a(11) =37a(12) =17a(13) =12a(14) =573a(15) =19a(16) =16a(17) =49a(18) =28a(19) =227a(20) =34a(21) =18a(22) =26a(23) =31a(24) =1371a(25) =20a(26) =41a(27) =36a(28) =8181a(29) =339