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Search: id:A114638
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| A114638 |
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Number of partitions of n such that number of parts is equal to the sum of parts counted without multiplicities. |
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+0
1
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| 1, 0, 0, 2, 1, 1, 0, 2, 2, 3, 5, 5, 6, 9, 7, 8, 14, 12, 16, 21, 28, 32, 43, 47, 61, 68, 84, 89, 109, 126, 140, 170, 198, 227, 261, 323, 362, 427, 501, 581, 658, 794, 880, 1036, 1175, 1355, 1526, 1776, 1985, 2281, 2588, 2943, 3312, 3799, 4271, 4852, 5497
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OFFSET
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1,4
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EXAMPLE
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a(10)=3 because we have [5,1,1,1,1,1],[3,3,3,1], and [3,2,2,1,1,1].
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MAPLE
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a:=proc(n) local P, c, j, S: with(combinat): P:=partition(n): c:=0: for j from 1 to nops(P) do S:=convert(P[j], set): if nops(P[j])=sum(S[i], i=1..nops(S)) then c:=c+1 else c:=c fi: c: od: end: seq(a(n), n=1..35); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 01 2006
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CROSSREFS
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Sequence in context: A113974 A122860 A123331 this_sequence A123340 A110962 A065715
Adjacent sequences: A114635 A114636 A114637 this_sequence A114639 A114640 A114641
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Feb 18 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Mar 01 2006
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