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A009591
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E.g.f. sinh(sin(x)) * sin(x) (even powers only).
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1
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0, 2, -4, -42, 888, -8086, -115468, 8863806, -275344656, 2488177106, 369676840940, -34139482063962, 1691837365047912, -16526563632072646, -7669129653528552220, 1088114395890103645710, -87525176659638470236704
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=2*sum(j=1..n, 4^(n-j)/(2*j-1)!*sum(i=0..j-1, (i-j)^(2*n)* binomial(2*j,i)*(-1)^(n+j-i))). [From Vladimir Kruchinin, Jun 09 2011]
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PROG
| (Maxima)
a(n):=2*sum(4^(n-j)/(2*j-1)!*sum((i-j)^(2*n)*binomial(2*j, i)*(-1)^(n+j-i), i, 0, j-1), j, 1, n); [From Vladimir Kruchinin, Jun 09 2011]
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CROSSREFS
| Sequence in context: A018312 A009547 A009811 * A009717 A018317 A059794
Adjacent sequences: A009588 A009589 A009590 * A009592 A009593 A009594
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KEYWORD
| sign
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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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