Number of loopless tree-rooted planar maps with 5 vertices and n faces and no isthmuses.
A006430
Number of loopless tree-rooted planar maps with 5 vertices and n faces and no isthmuses.
Terms
- a(0) =0a(1) =5a(2) =360a(3) =7350a(4) =73700a(5) =474588a(6) =2292790a(7) =9046807a(8) =30676440a(9) =92393015a(10) =252872984a(11) =639382605a(12) =1512137536a(13) =3377126024a(14) =7176513960a(15) =14599539314a(16) =28575632350a(17) =54036739617a(18) =99069119952a(19) =176618150000a(20) =306965183268a(21) =521265871700a(22) =866527603370
External references
- oeis: A006430