-2116

Appears in sequences

• n(n+180) is a square.at n=0A067632
• a(n) = -(-1)^n * n^2.at n=45A162395
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 187", based on the 5-celled von Neumann neighborhood.at n=31A270676
• Expansion of Product_{i>=1, j>=1, k>=1} (1 - x^(i*j*k)).at n=40A319359
• a(1) = 1; a(n) = n^2 * Sum_{d|n, d < n} (-1)^(n/d) a(d) / d^2.at n=45A361987