61126

Appears in sequences

• Expansion of (1 + 3*x)/(1 + 5*x + 9*x^2).at n=10A087169
• Expansion of 1/(1-x*(1-3*x)).at n=20A106852
• a(n) = -a(n-1) - 3*a(n-2) with n>1, a(0)=0, a(1)=1.at n=21A214733
• a(n) = n*(n^3 + 2*n^2 - 5*n + 10)/8.at n=26A294259