1,1

Number of generators of degree n of the Hopf algebra of 2-colored parking functions. Also, dimensions of the graded components of the primitive Lie algebra of the same Hopf algebra.

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

2^n*a(n) where a(n) is sequence A122708.

2^n*op(n, INVERTi([seq((k+1)^(k-1), k=1..n)]))

Sequence in context: A000532 A083831 A134245 this_sequence A009144 A132316 A136749

Adjacent sequences: A141310 A141311 A141312 this_sequence A141314 A141315 A141316

nonn

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