21847

Appears in sequences

• Number of distinct quadratic residues mod 2^n.at n=17A023105
• a(n) = (8*2^n-5*(-1)^n)/3.at n=13A083582
• First differences of A130624.at n=14A130625
• Partial sums of A130707.at n=15A130759
• a(n) = (2^n + 3 - 7*(-1)^n + 3*0^n)/6; or a(0) = 0 and for n > 0, a(n) = A005578(n-1) - (-1)^n.at n=17A135351
• a(n) = (5 + (-2)^n)/3.at n=16A140966
• Jacobsthal numbers A001045 incremented by 2.at n=16A153643
• a(n) = (4^n + 5)/3.at n=8A163834
• Table read by antidiagonals: T(n, k) is the k-th number with n-1 even-power summands in its base 2 representation.at n=53A165274
• Inverse binomial transform of A084640.at n=16A171501
• O.g.f. satisfies: A(x) = Sum_{n>=0} (n+4)^n * x^n * A(n*x)^n/n! * exp(-(n+4)*x*A(n*x)).at n=5A221413
• Number of n X 1 0..5 arrays with no element equal to another at a city block distance of exactly two, and new values 0..5 introduced in row major order.at n=9A222867
• Number of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at most 3.at n=18A242525
• Decimal representation of the n-th iteration of the "Rule 92" elementary cellular automaton starting with a single ON (black) cell.at n=14A267052
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 14", based on the 5-celled von Neumann neighborhood.at n=15A277955