30872

Appears in sequences

• Number of n-step spiral self-avoiding walks on hexagonal lattice, where at each step one may continue in same direction or make turn of 2*Pi/3 counterclockwise.at n=38A000511
• Number of positive integers <= 2^n of form x^2 + 18 y^2.at n=18A054231
• The number of permutations p of {1,...,n} such that |p(i)-p(i+1)| is in {1,2,3} for all i from 1 to n-1.at n=12A174700
• One of the two successive approximations up to 3^n for the 3-adic integer sqrt(-1/2).at n=10A309477