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A013571 E.g.f. exp(arctan(x)/exp(x))=1+x-1/2!*x^2-4/3!*x^3+9/4!*x^4+60/5!*x^5... 0
1, 1, -1, -4, 9, 60, -175, -2154, 6433, 140984, -404063, -14300174, 38333361, 2070386084, -5007071823, -406148697538, 844312637249, 103808494182512, -173366392362431, -33528470038125974, 40208654504239441 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

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! +.

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Sequence in context: A197859 A197997 A198178 * A002942 A028908 A220445

Adjacent sequences:  A013568 A013569 A013570 * A013572 A013573 A013574

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified April 19 08:09 EDT 2014. Contains 240739 sequences.