31443013

Appears in sequences

• a(n) = Sum_{k <= n/2 } binomial(n-2k, 3k).at n=35A137356
• Number of compositions of 5*n into parts 3 and 5.at n=21A369845
• a(n) = Sum_{k=0..floor((2*n+1)/3)} binomial(2*k+1,2*n-3*k+1).at n=25A391600