21791

Appears in sequences

• Structured deltoidal hexacontahedral numbers (vertex structure 9).at n=10A100166
• Matrix log of triangle A117396.at n=59A117398
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 0, -1), (-1, 1, 1), (1, 0, 0)}.at n=11A148069
• a(n) = n*(n+1)*(14*n-11)/6.at n=21A172076
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 459", based on the 5-celled von Neumann neighborhood.at n=32A272289
• Numbers n such that the Collatz iterations for n and n + 1 have the same length (A078417) but do not meet a certain condition. (See comments.)at n=34A274410
• Positive numbers k such that k and k + 1 are both positive negaFibonacci-Niven numbers (A331085) and -k and -(k + 1) are both negative negaFibonacci-Niven numbers (A331088).at n=34A331092
• G.f. A(x) satisfies A(x) = 1 - x/A(x)^2 * (1 - A(x) - A(x)^3).at n=15A371889
• Numbers k that divide the k-th Apéry number (A005258).at n=21A372943