Number of 3-element intersecting families (with not necessarily distinct sets) whose union is an n-element set.

A053157

Number of 3-element intersecting families (with not necessarily distinct sets) whose union is an n-element set.

Terms

    a(0) =1a(1) =5a(2) =32a(3) =235a(4) =1816a(5) =14055a(6) =107052a(7) =800315a(8) =5886416a(9) =42739855a(10) =307295572a(11) =2193374595a(12) =15571898616a(13) =110121224855a(14) =776543100092

External references