1,1

Dimensions of the graded components of the domain of cocommutativity 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.

Sequence in context: A052319 A127783 A116539 this_sequence A030875 A130906 A009628

Adjacent sequences: A141315 A141316 A141317 this_sequence A141319 A141320 A141321

nonn

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