Number of unlabeled rooted trees with n nodes where the outdegrees (branching factors) of adjacent nodes differ by at most one.

A260403

Number of unlabeled rooted trees with n nodes where the outdegrees (branching factors) of adjacent nodes differ by at most one.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =5a(8) =8a(9) =14a(10) =24a(11) =43a(12) =76a(13) =138a(14) =250a(15) =460a(16) =848a(17) =1576a(18) =2939a(19) =5516a(20) =10382a(21) =19629a(22) =37221a(23) =70820a(24) =135097a(25) =258426a(26) =495460a(27) =952083a(28) =1833176a(29) =3536502

External references