55861

Appears in sequences

• Fibonacci sequence beginning 1, 21.at n=18A022391
• Expansion of 1/((1-3x)(1-5x)(1-6x)(1-10x)).at n=4A028056
• a(n) = n*F(n) - (n-1)*F(n-1), where the F(j)'s are the Fibonacci numbers (F(0)=0, F(1)=1).at n=19A136391
• Number of unlabeled rooted trees with n nodes in which all positive outdegrees are odd.at n=18A298118
• G.f. satisfies A(x) = x + ( Sum_{n>=1} A(x^n) )^2.at n=9A382320