1579868160

Appears in sequences

• a(n)=2a(n-1)+4a(n-2)-4a(n-3)-4a(n-4).at n=22A099177
• Expansion of (1-4*x)/(1-6*x-12*x^2+8*x^3).at n=11A108476
• Number of (n+1) X (1+1) arrays of permutations of 0..n*2+1 filled by rows with each element moved a city block distance of 0 or 2, and rows and columns in increasing lexicographic order.at n=20A263598