-2784

Appears in sequences

• E.g.f.: arctan(sinh(x)*cos(x)) = x - 4/3!*x^3 + 60/5!*x^5 - 2784/7!*x^7 + 225680/9!*x^9...at n=3A012567
• a(n) = 2n(19-n).at n=48A182428
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 22", based on the 5-celled von Neumann neighborhood.at n=47A269718
• Product_{n>=1} (1 + x^n)^a(n) = 1 + Sum_{n>=1} sigma(n) * x^n, where sigma = A000203.at n=51A328776
• Expansion of 1/(Sum_{k>=0} x^(k^2))^2.at n=33A363774