Number of relational systems on n nodes. Also number of directed 3-multigraphs with loops on n nodes.
A001374
Number of relational systems on n nodes. Also number of directed 3-multigraphs with loops on n nodes.
Terms
- a(0) =4a(1) =136a(2) =44224a(3) =179228736
External references
- oeis: A001374