402073

Appears in sequences

• Expansion of g.f. (x^2+x+1)*(2*x^2+2*x+1)*(x-1)^2/((1-x^2-2*x^3)*(x^4+1)).at n=34A107850
• Regular triangle where T(n,k) is the number of antichains covering n vertices with k connected components.at n=31A317674