Iterates of A080067.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =11a(5) =34a(6) =82a(7) =287a(8) =923a(9) =3016a(10) =8664a(11) =37407a(12) =102983a(13) =414050a(14) =1488140a(15) =5330976a(16) =19367263a(17) =76887675a(18) =255935344a(19) =808348061a(20) =3420607749a(21) =14063447808a(22) =52376853939a(23) =178612888734a(24) =666146253450