323367

Appears in sequences

• Dimension of invariant subspace of Lie polynomials of degree 2n under action of SL_2(C) on free Lie algebra of rank 2.at n=14A028351
• a(n) = Sum_{k=0..[n/2]} C(n-k,k)^2 * n/(n-k), n>=1.at n=14A167539