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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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3
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0, 1, 7, 141, 5923, 426457, 46910271, 7318002277, 1536780478171, 418004290062513, 142957467201379447, 60042136224579367741, 30381320929637160076947, 18228792557782296046168201, 12796612375563171824410077103, 10390849248957295521420982607637
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| A. Petojevic, On Kurepa's Hypothesis for the Left Factorial, FILOMAT (Nis), 12:1 (1998), p. 29-37.
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FORMULA
| 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.rs), Aug 10 2002
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CROSSREFS
| Bisection of abs(A009628).
Sequence in context: A054606 A191956 A070074 * A179569 A082157 A104240
Adjacent sequences: A051394 A051395 A051396 * A051398 A051399 A051400
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KEYWORD
| nonn
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AUTHOR
| Aleksandar Petojevic.
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