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A138523
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a(n) = sum{k=1 to n} (2k-1)!.
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2
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1, 7, 127, 5167, 368047, 40284847, 6267305647, 1313941673647, 357001369769647, 122002101778601647, 51212944273488041647, 25903229683158464681647, 15537113273014144448681647, 10904406563691366305216681647
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MAPLE
| a:=proc(n) options operator, arrow: sum(factorial(2*k-1), k=1..n) end proc: seq(a(n), n=1..14); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 31 2008
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MATHEMATICA
| Table[Sum[(2i - 1)!, {i, 1, n}], {n, 1, 15}] - Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Mar 25 2008
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CROSSREFS
| Cf. A138524, A138525.
Cf. A007489.
Sequence in context: A139291 A092676 A002067 * A034670 A020516 A077585
Adjacent sequences: A138520 A138521 A138522 * A138524 A138525 A138526
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KEYWORD
| easy,nonn
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AUTHOR
| Leroy Quet Mar 23 2008
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EXTENSIONS
| More terms from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Emeric Deutsch (deutsch(AT)duke.poly.edu) and Robert G. Wilson v, Mar 25 2008
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