Number of hierarchical orderings ("societies") with at least 2 elements ("individuals") on each level for n labeled elements.
A097236
Number of hierarchical orderings ("societies") with at least 2 elements ("individuals") on each level for n labeled elements.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =10a(4) =31a(5) =271a(6) =1534a(7) =14393a(8) =117653a(9) =1253524a(10) =13140557a(11) =160679069a(12) =2026451948a(13) =28278471729a(14) =413532314433
External references
- oeis: A097236