-1361

Appears in sequences

• a(n) = 2*a(n-1) - a(n-2) - a(n-4).at n=19A131041
• a(n) = 2*a(n - 2) - a(n - 1) for n>1, a(0) = 4, a(1) = 5.at n=12A268741
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 291", based on the 5-celled von Neumann neighborhood.at n=21A271132
• Partial alternating sums of the sigma_2 function: a(n) = Sum_{k=1..n} (-1)^(k+1) * sigma_2(k).at n=34A379921