Number of unrooted nonseparable planar maps with n edges and a distinguished face.
A000087
Number of unrooted nonseparable planar maps with n edges and a distinguished face.
Terms
- a(0) =2a(1) =1a(2) =2a(3) =4a(4) =10a(5) =37a(6) =138a(7) =628a(8) =2972a(9) =14903a(10) =76994a(11) =409594a(12) =2222628a(13) =12281570a(14) =68864086a(15) =391120036a(16) =2246122574a(17) =13025721601a(18) =76194378042a(19) =449155863868
External references
- oeis: A000087