Number of rooted compound windmills with n nodes and leaves of 2 colors.
A032201
Number of rooted compound windmills with n nodes and leaves of 2 colors.
Terms
- a(0) =2a(1) =2a(2) =5a(3) =13a(4) =40a(5) =128a(6) =457a(7) =1660a(8) =6308a(9) =24409a(10) =96363a(11) =385535a(12) =1561706a(13) =6387135a(14) =26347199a(15) =109471366a(16) =457758461a(17) =1924845582a(18) =8134171456a(19) =34526723986a(20) =147139513066a(21) =629314845284
External references
- oeis: A032201