-1273

Appears in sequences

• a(n) = -a(n-2) - a(n-3).at n=34A112455
• a(n) = 1 + 3*n - 2*n^2.at n=26A168244
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 147", based on the 5-celled von Neumann neighborhood.at n=19A270293
• E.g.f.: exp (e.g.f. for the "cusp form" A002408).at n=5A302201