16781311

Appears in sequences

• Number of reversible string structures with n beads using exactly two different colors.at n=25A056326
• Expansion of (1-3*x+3*x^2)/(1-5*x+10*x^2-10*x^3+4*x^4).at n=24A098179
• a(n) = 4^n + 2^n - 1.at n=12A099393
• Square roots of the deficiencies of the squares of A289274.at n=12A288144
• Square roots of the deficiencies of the squares of A289275.at n=43A288145