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Search: id:A161702
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| A161702 |
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(-n^3 + 9*n^2 - 5*n + 3)/3. |
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+0
22
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| 1, 2, 7, 14, 21, 26, 27, 22, 9, -14, -49, -98, -163, -246, -349, -474, -623, -798, -1001, -1234, -1499, -1798, -2133, -2506, -2919, -3374, -3873, -4418, -5011, -5654, -6349, -7098, -7903, -8766, -9689, -10674, -11723, -12838, -14021, -15274
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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{a(k): 0 <= k < 4} = divisors of 14:
a(n) = A027750(A006218(13) + k + 1), 0 <= k < A000005(14).
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LINKS
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R. Zumkeller, Enumerations of Divisors
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FORMULA
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a(n) = C(n,0) + C(n,1) + 4*C(n,2) - 2*C(n,3).
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EXAMPLE
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Differences of divisors of 14 to compute the coefficients of their interpolating polynomial, see formula:
1 ... 2 ... 7 ... 14
.. 1 ... 5 ... 7
..... 4 ... 2
....... -2.
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CROSSREFS
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A005408, A000124, A016813, A086514, A000125, A058331, A002522, A161701, A161703, A000127, A161704, A161706, A161707, A161708, A161710, A080856, A161711, A161712, A161713, A161715, A006261.
Sequence in context: A057126 A018349 A018363 this_sequence A087324 A008865 A018392
Adjacent sequences: A161699 A161700 A161701 this_sequence A161703 A161704 A161705
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KEYWORD
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sign
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 17 2009
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