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Search: id:A048688
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| A048688 |
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Number of classes generated by function A000005 when applied to binomial coefficients. |
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+0
1
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| 1, 2, 2, 3, 3, 3, 3, 4, 4, 5, 5, 5, 5, 6, 5, 8, 6, 6, 8, 9, 6, 11, 7, 11, 10, 10, 9, 11, 11, 11, 10, 15, 13, 15, 11, 15, 16, 14, 14, 16, 15, 15, 12, 18, 17, 18, 12, 22, 18, 20, 19, 21, 17, 20, 19, 24, 21, 21, 15, 25, 19, 18, 19, 24, 21, 28, 25, 26, 24, 29, 19, 29, 25, 24, 26, 29, 19
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n) = Length[ Union[ Table[ A000005[ binomial[ n, k ] ], {k, 0, n} ] ] ]
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EXAMPLE
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For n=9 A000005({C(9,k)})={1,3,9,12,12,12,12,9,3,1} includes 4 distinct values so generating 4 classes of k values: {0,9},{1,8},{2,7} and {3,4,5,6}. So a(9)=4
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CROSSREFS
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A000005, A001221, A007947.
Sequence in context: A093875 A114214 A074198 this_sequence A092695 A033270 A103264
Adjacent sequences: A048685 A048686 A048687 this_sequence A048689 A048690 A048691
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu)
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