121878240

Appears in sequences

• Expansion of (1 - x)*(1 + 2*x) / ((1 + x)*(1 - 4*x - x^2)).at n=13A102129
• Upper midsequence of the Fibonacci numbers (1,2,3,5,8,...) and Lucas numbers (1,3,4,7,11,...); see Comments.at n=38A355325