Number of 3-uniform hypergraphs on n labeled vertices where every two edges have exactly one vertex in common.
A323299
Number of 3-uniform hypergraphs on n labeled vertices where every two edges have exactly one vertex in common.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =26a(6) =261a(7) =3216a(8) =19617a(9) =80860a(10) =262651a(11) =737716a(12) =1920821a(13) =5013152a(14) =14277485a(15) =47610876a(16) =186355041a(17) =820625616a(18) =3869589607a(19) =19039193980a(20) =96332399701a(21) =499138921736
External references
- oeis: A323299