87634

Appears in sequences

• Expansion of 1/((1-x)*(1-x-2*x^3)).at n=21A003479
• Number of dying nodes (withering branches) at generation n in the binary tree of persistently squarefree numbers (A293230).at n=45A293520
• a(0)=0; for n > 0, a(n) = 2*a(n-1) if n-1 is prime, a(n-1) + 1 otherwise.at n=48A354973