39692

Appears in sequences

• Number of length n+4 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.at n=13A255111
• Half volumes of concertina hypercubes: a(n) = A300697(n)/2.at n=6A300698
• Expansion of x*(2 - x - x^2 - 2*x^3)/(1 - x - x^2)^2.at n=18A339610
• a(n) = Sum_{k=0..n} 4^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).at n=6A360319
• Intersection of A361073 and 2 * A361611.at n=42A361215