210763776

Appears in sequences

• Expansion of ((1+x)/(1-2x))^2.at n=22A113070
• A007318 * A000125.at n=20A134396
• Binomial transform of A008805 (triangular numbers with repeats).at n=23A158920
• a(n) = ((n-1)^2 + 2)*2^(n-2).at n=20A356888