1310698

Appears in sequences

• a(n+3) = 3*a(n+2) - 2*a(n+1) + 1 with a(0)=1, a(1)=5.at n=18A094002
• Expansion of (1-3*x+6*x^2-3*x^3)/((1-x)^2*(1-2*x)).at n=19A188589