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

A260353

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

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =3a(5) =5a(6) =9a(7) =20a(8) =42a(9) =87a(10) =189a(11) =419a(12) =926a(13) =2080a(14) =4724a(15) =10783a(16) =24785a(17) =57374a(18) =133454a(19) =311882a(20) =732084a(21) =1725019a(22) =4078661a(23) =9674563a(24) =23014591a(25) =54894296a(26) =131254246a(27) =314544591a(28) =755369735a(29) =1817530413

External references