89043

Appears in sequences

• a(n) = 4*a(n-1) - a(n-2) for n>1, a(0)=3, a(1)=9.at n=8A082841
• a(n) = 4*a(n-2) - a(n-4).at n=16A083336
• a(n) = 87*2^n - 45.at n=10A304613
• G.f.: 1/(1-x)^3 * Product_{k>=1} (1 + x^k).at n=31A325951