Records in A087162: A087162(a(n))=n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =7a(4) =23a(5) =91a(6) =383a(7) =1639a(8) =7043a(9) =30295a(10) =130343a(11) =560827a(12) =2413103a(13) =10383031a(14) =44675843a(15) =192230119a(16) =827123063a(17) =3558924955a(18) =15313255583