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A009201
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E.g.f. exp(sin(sin(x))).
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0
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1, 1, 1, -1, -7, -7, 73, 335, -687, -12367, -19471, 461119, 2839561, -15282199, -260138759, -15084017, 22560194593, 113205762401, -1856685484703, -23353924295169, 115492830956953, 3999727786726617, 5211807618131753, -646193037236457649
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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PROG
| (Maxima)
a(n):=if n=0 then 1 else sum((sum((4^(j+1)*(sum((i-n/2+j)^(n-2*j+2*k)*(-1)^(i)*binomial(n-2*j, i), i, 0, (n/2-j)))*sum((-n/2+j-k+i)^n*binomial(n-2*j+2*k, i)*(-1)^(j-i), i, 0, (n/2-j+k)))/(n-2*j+2*k)!, k, 0, j))/(n-2*j)!, j, 0, (n-1)/2); [From Vladimir Kruchinin, Jun 20 2011]
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CROSSREFS
| Sequence in context: A165425 A153272 A117860 * A065240 A178708 A072399
Adjacent sequences: A009198 A009199 A009200 * A009202 A009203 A009204
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KEYWORD
| sign,easy
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
| Extended with signs Mar 15 1997 by Olivier Gerard.
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