7281250

Appears in sequences

• a(n) = (1/sqrt(5))*((sqrt(5) + 1)*((15 + 5*sqrt(5))/2)^(n-1) + (sqrt(5) - 1)*((15 - 5*sqrt(5))/2)^(n-1)).at n=6A109106
• Row sums of Riordan array ((1-3x+x^2)/(1-4x+3x^2), x(1-2x)/(1-4x+3x^2)).at n=13A147748
• Number of paths of length n starting at initial node of the path graph P_9.at n=26A178381
• a(n) = Sum_{k>=0} (-1)^k*binomial(n,5*k+3).at n=26A289388