a(n) = smallest k such that A350877(k) = n, or -1 if n does not appear in A350877.

Terms

a(0) =1a(1) =7a(2) =2a(3) =6a(4) =71a(5) =3a(6) =25a(7) =5a(8) =22a(9) =70a(10) =30a(11) =13a(12) =345a(13) =24a(14) =27a(15) =16a(16) =161a(17) =21a(18) =148a(19) =69a(20) =32a(21) =29a(22) =51a(23) =43a(24) =1154a(25) =344a(26) =161336a(27) =23a(28) =34a(29) =26