Total number of occurrences of the pattern 1=2<3 in all preferential arrangements (or ordered partitions) of n elements.

A240799

Total number of occurrences of the pattern 1=2<3 in all preferential arrangements (or ordered partitions) of n elements.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =20a(4) =310a(5) =4660a(6) =72485a(7) =1193080a(8) =20938764a(9) =392485560a(10) =7850724915a(11) =167242351100

External references