The sum over all subsets S of [n] of the squares of the number of permutations with descent set = S.
A060350
The sum over all subsets S of [n] of the squares of the number of permutations with descent set = S.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =10a(4) =88a(5) =1216a(6) =24176a(7) =654424a(8) =23136128a(9) =1035227008a(10) =57186502912
External references
- oeis: A060350