Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.
A151595
Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =15048a(2) =53145540a(3) =33478094610
External references
- oeis: A151595