Number of unrooted unlabeled connected four-regular maps on a compact closed oriented surface with n vertices (and thus 2*n edges).
A292206
Number of unrooted unlabeled connected four-regular maps on a compact closed oriented surface with n vertices (and thus 2*n edges).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =36a(4) =365a(5) =5250a(6) =103801a(7) =2492164a(8) =70304018a(9) =2265110191a(10) =82013270998
External references
- oeis: A292206