269667

Appears in sequences

• a(0)=1, otherwise a(n) = Sum_{k=0..floor((n-1)/2)} binomial(n-k-1,k)*a(n-1-2*k).at n=15A172383
• Coefficient of x^n in the expansion of 1 / (1-x-x^2)^(3*n).at n=6A370620