24342647424domain: NAppears in sequencesNumber of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 local maxima.at n=7A159720Triangle read by rows: T(n,k) is the number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly k local maxima.at n=42A334778