106135

Appears in sequences

• Expansion of (1+x-x^2)/((1-x)*(1-3*x^2-x^3)).at n=18A217733
• Number of distinct characteristic polynomials of trees with n nodes.at n=18A226594
• a(n) = Sum_{k=1..n} k^2*tau(k), where tau is A000005.at n=40A319085