9029425

Appears in sequences

• a(n) = Sum_{k=0..floor(n/2)} binomial(n+4*k,n-2*k).at n=15A373904
• Expansion of (1 + x - x^3)/((1 + x - x^3)^2 - 4*x).at n=21A376785
• Expansion of 1 / ((1-x)^2 - x^6).at n=42A392541