1972904domain: NAppears in sequencesNumber of permutations of order n with the length of longest run equal to 3.at n=9A001251Triangle read by rows: number of permutations of 1..n by length of longest run.at n=43A010026Triangle read by rows: number of permutations of 1..n by length l of longest run (n >= 1, 1 <= l <= n).at n=47A211318