Dimension of invariant subspace of Lie polynomials of degree 2n under action of SL_2(C) on free Lie algebra of rank 2.
A028351
Dimension of invariant subspace of Lie polynomials of degree 2n under action of SL_2(C) on free Lie algebra of rank 2.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =5a(5) =9a(6) =33a(7) =85a(8) =276a(9) =827a(10) =2693a(11) =8626a(12) =28639a(13) =95393a(14) =323367a(15) =1104525a(16) =3813797a(17) =13266366a(18) =46509357a(19) =164098390
External references
- oeis: A028351