281667368

Appears in sequences

• Diagonal sums of the triangle A190152.at n=18A190154
• a(n) = Sum_{k=0..floor(n/2)} binomial(n+4*k,n-2*k).at n=18A373904
• Expansion of (1 - x - x^3)/((1 - x - x^3)^2 - 4*x^4).at n=27A375279