25883domain: NAppears in sequencesTriangle of Stirling numbers of order 6.at n=15A059025Numbers k such that the smoothly undulating palindromic number (32*10^k - 23)/99 is a prime.at n=9A062217Number of peaks in all Dyck n-paths after changing each valley to a peak by the transform DU -> UD.at n=9A216318