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Search: id:A091530
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| A091530 |
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Sum {k=1 to n} H(k) k! (n-k)!, where H(k) is the k-th harmonic number. |
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+0
2
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| 1, 4, 16, 73, 388, 2396, 17024, 137544, 1248816, 12603288, 140018688, 1698063552, 22318009344, 315942698880, 4791898275840, 77510315197440, 1331759355586560, 24220225133061120, 464796175236710400, 9385769913543475200
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OFFSET
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1,2
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MATHEMATICA
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Table[ Sum[ HarmonicNumber[k]k!(n - k)!, {k, 1, n}], {n, 1, 20}] (from Robert G. Wilson v Jan 14 2004)
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CROSSREFS
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Cf. A091528.
Adjacent sequences: A091527 A091528 A091529 this_sequence A091531 A091532 A091533
Sequence in context: A007234 A096244 A030131 this_sequence A109957 A101205 A050540
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jan 08 2004
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EXTENSIONS
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Extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 14 2004
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