100502domain: NAppears in sequencesDecimal part of a(n)^(1/5) starts with reversal of its integer part: first term of runs.at n=9A034311Least number k such that between k! and (k+1)! there are n powers of ten.at n=5A084420Number of decorated Dyck paths of length n without peaks at level 1 ending at arbitrary levels.at n=18A354539