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Search: id:A067174
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| A067174 |
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Product of the sum of all the subsets of the numbers from 1 to n. |
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+0
1
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| 1, 6, 2160, 9144576000, 47354185460054753280000000, 18458571748581562066056556704775089466054740541440000000000000, 47233748702462500435567511289038040021397635763497380756284093804903384444460824\ 501772093090703929198069912961024000000000000000000000000000
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(3) = 1 * 2 * 3 * (1+2) * (1+3) * (2+3) * (1+2+3) = 1*2*3*3*4*5*6 = 2160
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MAPLE
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with(combinat, subsets): A067174 := proc(n) local S, ans, i: S := subsets([seq(i, i=1..n)]): ans := 1: S[nextvalue](): while not S[finished] do ans := ans*add(i, i=S[nextvalue]()) od: RETURN(ans): end:
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CROSSREFS
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Sequence in context: A059081 A056048 A051113 this_sequence A153300 A059203 A069643
Adjacent sequences: A067171 A067172 A067173 this_sequence A067175 A067176 A067177
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KEYWORD
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nonn
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AUTHOR
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Jonathan Ayres (jonathan.ayres(AT)ntlworld.com), Jan 06 2002
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EXTENSIONS
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More terms from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Jan 06 2002
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