409640

Appears in sequences

• E.g.f.: tanh(arctan(x)+log(x+1))=2*x-1/2!*x^2-16/3!*x^3+42/4!*x^4+500/5!*x^5...at n=8A012967
• Closed walks of length n along the edges of a pentagon based at a vertex.at n=21A054877
• Number of walks of length 2n+1 between two nodes at distance 5 in the cycle graph C_10.at n=8A095933
• a(n) = Sum_{ k >= 0} binomial(n,5*k+3).at n=21A139748
• a(n) = 1600*n^2 + 40.at n=15A158775
• sum_{k=floor[(n+5)/2] mod 5} C(n,k).at n=21A173126
• a(n) = A351477(n) * FA where F is the Fermat point of a primitive integer-sided triangle ABC with A < B < C < 2*Pi/3 and FA + FB + FC = A336329(n).at n=34A351801