Number of permutations of 7 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.
A151610
Number of permutations of 7 indistinguishable copies of 1..n arranged in a circle with exactly 2 adjacent element pairs in decreasing order.
Terms
- a(0) =0a(1) =252a(2) =4935a(3) =56560a(4) =572215a(5) =5503260a(6) =51377823a(7) =469758912a(8) =4227854463a(9) =37580958940a(10) =330712475863
External references
- oeis: A151610