1,1

Number of generators of degree n of the primitive Lie algebra of the Hopf algebra of 2-colored planar binary trees.

J.-C. Novelli and J.-Y. Thibon, Free quasi-symmetric functions and descent algebras for wreath products and noncommutative multi-symmetric functions

Cf. A025225, A141318.

Sequence in context: A013208 A094370 A066084 this_sequence A001289 A103045 A126464

Adjacent sequences: A141316 A141317 A141318 this_sequence A141320 A141321 A141322

nonn

Jean-Yves Thibon (jyt(AT)univ-mlv.fr), Jun 26 2008