Number of rooted 2-connected loopless 4-regular planar maps with n inner faces.
A099553
Number of rooted 2-connected loopless 4-regular planar maps with n inner faces.
Terms
- a(0) =1a(1) =2a(2) =10a(3) =42a(4) =209a(5) =1066a(6) =5726a(7) =31688a(8) =180234a(9) =1047356a(10) =6198500a(11) =37253790a(12) =226891665a(13) =1397880330a(14) =8699804598a(15) =54629525808a(16) =345778883678
External references
- oeis: A099553