46852

Appears in sequences

• Numbers k such that k^2 divides 21^k-1.at n=42A128401
• 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, 0, 1), (0, 0, 1), (0, 1, -1), (1, -1, 0), (1, 1, 0)}.at n=8A150621
• a(n) = Catalan(n) - A000245(n-2).at n=9A220902
• a(n) = 2*A000447(n).at n=26A259110
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 473", based on the 5-celled von Neumann neighborhood.at n=39A272425
• a(n) is the least k such that A330241(k) = n.at n=19A329773