Number of rooted planar maps with 3 vertices and n faces and no isthmuses.
A006420
Number of rooted planar maps with 3 vertices and n faces and no isthmuses.
Terms
- a(0) =1a(1) =16a(2) =150a(3) =1104a(4) =7077a(5) =41504a(6) =228810a(7) =1205520a(8) =6135690a(9) =30391520a(10) =147277676a(11) =700990752a(12) =3286733805a(13) =15215673408a(14) =69675615234a(15) =316058238864
External references
- oeis: A006420