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A060015
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Sum of orders of all even permutations of n letters.
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5
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1, 1, 7, 31, 211, 1411, 12601, 137047, 1516831, 18111751, 223179001, 2973194071, 46287964867, 835826439631, 15722804528341, 292673102609791, 5177400032329231, 102538737981192607, 2284570602107946601
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| For n = 4 there is 1 even permutation (1) of order 1, 3 even permutations (12)(34) etc. of order 2 and 8 (123) etc. of order 3, for a total of 31.
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CROSSREFS
| Cf. A060014.
Sequence in context: A139060 A155521 A201116 * A094711 A143564 A153028
Adjacent sequences: A060012 A060013 A060014 * A060016 A060017 A060018
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KEYWORD
| nonn,nice,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 17 2001
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 18 2001
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