262655

Appears in sequences

• Number of reversible string structures with n beads using exactly two different colors.at n=19A056326
• a(n) = 4^n + 2^n - 1.at n=9A099393
• Numbers k such that (28*10^k - 43)/3 is prime.at n=34A271377
• a(n) = (2^n - (-1+i)^n - (-1-i)^n)/4 - 1 where i is the imaginary unit.at n=19A275016