a(n) = index of first appearance of n in A096859.

Terms

a(0) =1a(1) =3a(2) =7a(3) =18a(4) =34a(5) =52a(6) =100a(7) =422a(8) =882a(9) =1008a(10) =960a(11) =912a(12) =784a(13) =1497a(14) =3187a(15) =13456a(16) =21336a(17) =42682a(18) =69696a(19) =50176a(20) =73191a(21) =112896a(22) =88452a(23) =151828a(24) =140736a(25) =198876a(26) =245028a(27) =187272a(28) =252964a(29) =207936