Number of permutations of length n with exactly three valleys.

A000517

Number of permutations of length n with exactly three valleys.

Terms

    a(0) =272a(1) =7936a(2) =137216a(3) =1841152a(4) =21253376a(5) =222398464a(6) =2174832640a(7) =20261765120a(8) =182172651520

External references