40421

Appears in sequences

• Expansion of 1/(x^k*(1-x-2*x^(k+1))) for k=9.at n=42A143452
• Expansion of 1/(-x^11 + x^10 + 2*x^7 - x^6 - x^5 - x^4 - x^2 + 2*x + 1).at n=12A157748
• Number of bifurcating nodes at generation n in the binary tree of persistently squarefree numbers (see A293230).at n=37A293522
• Number of integer partitions of n containing all prime indices of their parts.at n=48A324753
• Euler transform of 2^floor(n/2), (A016116).at n=18A358369
• a(n) = Sum_{k=0..floor(n/2)} (k+1) * binomial(2*k,2*n-4*k).at n=18A382300