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Search: id:A060015
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| A060015 |
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Sum of orders of all even permutations of n letters. |
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+0
6
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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; listen)
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OFFSET
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1,3
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EXAMPLE
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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
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Cf. A060014.
Adjacent sequences: A060012 A060013 A060014 this_sequence A060016 A060017 A060018
Sequence in context: A102239 A139151 A139060 this_sequence A094711 A143564 A135630
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KEYWORD
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nonn,nice,easy
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AUTHOR
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njas, Mar 17 2001
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)Eunet.yu), Mar 18 2001
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