2488156

Appears in sequences

• a(n) is the number of basic ideals in the standard Borel subalgebra of the untwisted affine Lie algebra sl_n.at n=10A194460
• Expansion of g.f. (6 + 5*x - 20*x^2 - 12*x^3 + 12*x^4 + 3*x^5)/(1 + x - 5*x^2 - 4*x^3 + 6*x^4 + 3*x^5 - x^6).at n=22A216605