Number of unlabeled rooted trees with n nodes where the outdegrees (branching factors) of adjacent nodes differ by exactly one.
A257654
Number of unlabeled rooted trees with n nodes where the outdegrees (branching factors) of adjacent nodes differ by exactly one.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =0a(4) =0a(5) =1a(6) =1a(7) =0a(8) =0a(9) =1a(10) =1a(11) =0a(12) =0a(13) =2a(14) =2a(15) =0a(16) =1a(17) =3a(18) =3a(19) =1a(20) =2a(21) =6a(22) =6a(23) =3a(24) =6a(25) =11a(26) =11a(27) =9a(28) =15a(29) =23
External references
- oeis: A257654