Number of tree-like polyhexes rooted at a hexagon and containing n hexagons.
A002213
Number of tree-like polyhexes rooted at a hexagon and containing n hexagons.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =20a(4) =84a(5) =354a(6) =1540a(7) =6704a(8) =29610a(9) =131745a(10) =591049a(11) =2669346a(12) =12131148a(13) =55431285a(14) =254539897a(15) =1174027598a(16) =5436826110a(17) =25269402555a(18) =117838870833a(19) =551192276450
External references
- oeis: A002213