Number of permutations of [n] with equal lengths of the longest increasing subsequence and the longest decreasing subsequence.

A321313

Number of permutations of [n] with equal lengths of the longest increasing subsequence and the longest decreasing subsequence.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =4a(4) =36a(5) =256a(6) =1282a(7) =9864a(8) =99976a(9) =970528a(10) =9702848a(11) =113092200a(12) =1500063930a(13) =20985500212a(14) =305177475748

External references