-1659

Appears in sequences

• Site percolation series for hexagonal net.at n=6A030131
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 397", based on the 5-celled von Neumann neighborhood.at n=23A271692
• Deficiency of squares: a(n) = 2n^2 - sigma(n^2).at n=41A377879