Number of anti-hierarchical decompositions of an n-pyramidal hierarchy of n*(n+1)/2 = A000217(n) labeled elements.
A153744
Number of anti-hierarchical decompositions of an n-pyramidal hierarchy of n*(n+1)/2 = A000217(n) labeled elements.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =39a(4) =346a(5) =5065a(6) =126061
External references
- oeis: A153744