1/3 of the number of permutations of 2 indistinguishable copies of 1..n with exactly 6 local maxima.

A152498

1/3 of the number of permutations of 2 indistinguishable copies of 1..n with exactly 6 local maxima.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =76739a(6) =42734373a(7) =10478384089

External references