-2497

Appears in sequences

• a(n) = a(n - 1) - 2*a(n - 2) + a(n - 3) - 2*a(n - 4) + a(n - 5).at n=35A122582
• Unreduced numerators in triangle that leads to the Euler numbers A198631(n)/A006519(n+1).at n=41A238800
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 97", based on the 5-celled von Neumann neighborhood.at n=29A270155