54216

Appears in sequences

• Numbers n such that 117*2^n-1 is prime.at n=49A050584
• Nonprime numbers k such that k | sigma_3(k) + phi(k)^3.at n=19A055970
• McKay-Thompson series of class 26A for Monster.at n=37A058596
• Triangle T(n,k) read by rows; given by [0,1,0,1,0,1,0,1,...] DELTA [1,1,1,2,1,3,1,4,1,5,1,6,...], where DELTA is Deléham's operator defined in A084938.at n=60A085838
• Number of equilateral triangles with coordinates (x,y,z) in the set {0, 1,...,n}.at n=8A102698
• Number of walks on cubic lattice starting at (1,1,1), ending at (n,n,n), remaining in the first (nonnegative) octant and using steps (0,-1,2), (0,2,-1), (-1,0,2), (2,0,-1), (-1,2,0), and (2,-1,0).at n=4A277262
• p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - 2 S^2)^2.at n=11A291024
• Number of n-step closed paths on the E6 lattice.at n=4A292881
• Number of unlabeled rooted trees with n nodes where the branches of no branch of the root form a submultiset of the branches of the root.at n=14A324838
• a(n) = Sum_{k=0..n} 2^k * 3^(n-k) * binomial(2*n+1,k) * binomial(2*n-k,n-k).at n=4A385669