211736

Appears in sequences

• Configurations of linear chains in a square lattice.at n=12A033323
• Expansion of (1-x)^(-1)/(1+2*x+x^2-2*x^3).at n=27A077928
• Product of Lucas (A000204) and a Pell Companion series (A002203).at n=8A085293
• Expansion of Product_{k>=0} ((1+x^(3*k+1))/(1-x^(3*k+1)))^2.at n=37A261649