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http://functions.wolfram.com/01.24.21.0035.01
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Integrate[z^n E^(b z) Sech[a z], z] == n! 2 E^((a + b) z)
Sum[(((-1)^j z^(-j + n))/((n - j)! (a + b)^(j + 1)))
HypergeometricPFQ[{Subscript[c, 1], \[Ellipsis], Subscript[c, j + 1],
1}, {1 + Subscript[c, 1], \[Ellipsis], 1 + Subscript[c, j + 1]},
-E^(2 a z)], {j, 0, n}] /; Subscript[c, 1] == Subscript[c, 2] ==
\[Ellipsis] == Subscript[c, n + 1] == (a + b)/(2 a) &&
Element[n, Integers] && n >= 0
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Date Added to functions.wolfram.com (modification date)
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