Total number of descents in all heapable permutations of length n.
A389991
Total number of descents in all heapable permutations of length n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =4a(4) =21a(5) =117a(6) =751a(7) =5396a(8) =43402a(9) =386696a(10) =3790252a(11) =40578094a(12) =471609679a(13) =5917541371a(14) =79770698784
External references
- oeis: A389991