a(n) is the least k such that A098598(k) = n.

Terms

a(0) =40a(1) =24a(2) =19a(3) =17a(4) =16a(5) =10a(6) =23a(7) =21a(8) =92a(9) =313a(10) =155a(11) =551a(12) =2575a(13) =757a(14) =13537a(15) =5525a(16) =35133a(17) =33953a(18) =332975a(19) =355573a(20) =3157535a(21) =1571573a(22) =2732737a(23) =3775555a(24) =5737571a(25) =37332775