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The inner function is arctan(x)/exp(x) = 2*x/2! -6*x^2/2! +4*x^3/3! +20*x^4/4! +54*x^5/5! -770*x^6/6! -2232*x^7/7! +.
Table of n, a(n) for n=0..20.
Sequence in context: A197859 A197997 A198178 * A002942 A028908 A220445
Adjacent sequences: A013568 A013569 A013570 * A013572 A013573 A013574
Patrick Demichel (patrick.demichel(AT)hp.com)