85864domain: NAppears in sequencesNumbers k such that (10^k - 1)/9 + 6 is prime.at n=18A097684Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k ascents of length 2 starting at an odd level (0<=k<=floor(n/2)-1 for n>=2; k=0 for n=0,1).at n=40A114463