1/12 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 2 local maxima.

A152499

1/12 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 2 local maxima.

Terms

    a(0) =0a(1) =1a(2) =30a(3) =664a(4) =13632a(5) =274432a(6) =5497344a(7) =109987840a(8) =2199945216a(9) =43999756288a(10) =879998926848

External references