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Search: id:A051397
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| A051397 |
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a(n) = (2*n-2)*(2*n-1)*a(n-1)+1. |
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+0
3
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| 0, 1, 7, 141, 5923, 426457, 46910271, 7318002277, 1536780478171, 418004290062513, 142957467201379447, 60042136224579367741, 30381320929637160076947, 18228792557782296046168201, 12796612375563171824410077103, 10390849248957295521420982607637
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OFFSET
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0,3
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REFERENCES
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A. Petojevic, On Kurepa's Hypothesis for the Left Factorial, FILOMAT (Nis), 12:1 (1998), p. 29-37.
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FORMULA
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a(n) = Sum_{k=0..n-1} (2*n-1)!/(2*k+1)!. a(n) = floor((2*n-1)!*sinh(1)). - Vladeta Jovovic (vladeta(AT)Eunet.yu), Aug 10 2002
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CROSSREFS
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Bisection of abs(A009628).
Adjacent sequences: A051394 A051395 A051396 this_sequence A051398 A051399 A051400
Sequence in context: A085708 A054606 A070074 this_sequence A082157 A104240 A012826
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KEYWORD
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nonn
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AUTHOR
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Aleksandar Petojevic.
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