The Pippenger product is an unexpected Wallis-like formula for given by
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(1) |
(OEIS A084148 and A084149; Pippenger 1980). Here, the th term for is given by
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(2) | |||
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(3) |
where is a double factorial and is the gamma function.
See also
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References
Pippenger, N. "An Infinite Product for ." Amer. Math. Monthly 87, 391, 1980.Sloane, N. J. A. Sequences A084148 and A084149 in "The On-Line Encyclopedia of Integer Sequences."
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Cite this as:
Weisstein, Eric W. "Pippenger Product." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/PippengerProduct.html