Number of permutations of some {1,2,...,k} in which the sum of the positions of the right-to-left minima is n.

A143948

Number of permutations of some {1,2,...,k} in which the sum of the positions of the right-to-left minima is n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =28a(6) =130a(7) =759a(8) =5206a(9) =41260a(10) =369043a(11) =3676429a(12) =40334375a(13) =483102302a(14) =6271504796a(15) =87706308280

External references