233011

Appears in sequences

• a(n) = (1/9)(2^(n+3)-(-1)^n(3n-1)).at n=18A103196
• Expansion of (1-2x^2)/((1-2x)(1+x)^2).at n=20A113954
• a(n) is the smallest number whose greedy representation as a sum of terms of A126684 uses n terms.at n=9A302757