Sum over all permutations of [n] of the product of the lengths of longest increasing subsequence and longest decreasing subsequence.
A321275
Sum over all permutations of [n] of the product of the lengths of longest increasing subsequence and longest decreasing subsequence.
Terms
- a(0) =1a(1) =4a(2) =22a(3) =132a(4) =890a(5) =6812a(6) =58422a(7) =555900a(8) =5819658a(9) =66554180a(10) =825839718a(11) =11054124886a(12) =158795559000
External references
- oeis: A321275