Number of unlabeled octagonal 2-trees with n octagons.
A094652
Number of unlabeled octagonal 2-trees with n octagons.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =26a(5) =245a(6) =2737a(7) =35291a(8) =483819a(9) =6937913a(10) =102666626a(11) =1558022255a(12) =24133790815a(13) =380320794122
External references
- oeis: A094652