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A003126
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Value of an urn with n balls of type -1 and n+1 balls of type +1.
(Formerly M3501)
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0
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1, 4, 15, 58, 226, 882, 3457, 13606, 53683, 212090, 838484, 3319596, 13159676, 52220801, 207374051, 823906473, 3274464556, 13019414133, 51790661881, 206112818880, 820583696869, 3267935428368, 13017497498243, 51863262314021
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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FORMULA
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a(n) = B(n, n + 1) where B(n, m) is defined in A003125.
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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