42676

Appears in sequences

• Bisection (odd part) of Chebyshev sequence with Diophantine property.at n=7A077235
• Combined Diophantine Chebyshev sequences A077236 and A077235.at n=15A077238
• The values of 'a' in a^2 + b^2 = c^2, where b - a = 17 and gcd(a, b, c) = 1.at n=9A117473
• Nonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+17)^2 = y^2.at n=14A118120
• a(n) = 7*a(n-1) - 7*a(n-2) + a(n-3) for n > 2; a(0) = 28, a(1) = 207, a(2) = 1248.at n=4A155466
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 139", based on the 5-celled von Neumann neighborhood.at n=39A270280
• The fixed points of A355636.at n=22A355637
• Number of non-isomorphic directed graphs reachable in n steps (and no fewer) by at least 2*n agents using the ANY protocol (see A318154).at n=8A383389
• Total number of runs of 1's in all length n binary words in which 1's occur in runs of at least 3.at n=20A387573
• Site percolation series for square lattice: coefficients of the power series expansion in powers of q=1-p of the probability that a given site (not assumed to be open) belongs to the infinite cluster, where p is the probability that a site is open.at n=15A391388
• a(n) = Sum_{k=0..n} (k+1) * binomial(2*k+1,2*n-2*k+1).at n=9A391890