9217554129

Appears in sequences

• Construct triangle in which n-th row is obtained by expanding (1 + x + x^2)^n and take the next-to-central column.at n=22A005717
• a(n) equals the coefficient of x^n in Sum_{m>=0} (x^m + 1 + 1/x^m)^m for n >= 1.at n=22A316591