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Search: id:A058160
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| A058160 |
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Triangle: Labeled commutative monoids of order n with k idempotents with a fixed identity. |
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+0
4
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| 1, 1, 1, 1, 6, 2, 4, 45, 36, 9, 6, 408, 648, 348, 76, 60, 7195, 13500, 11790, 5280, 1065, 120, 200016, 369930, 425280, 293640, 118890, 22566, 1920
(list; table; graph; listen)
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OFFSET
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1,5
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LINKS
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Index entries for sequences related to monoids
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EXAMPLE
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1; 1,1; 1,6,2; 4,45,36,9; 6,408,648,348,76; ...
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CROSSREFS
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a(n, k)=A058159(n, k)/n. Row sums give A058156. Column 1: A058162. Main diagonal A058164.
Sequence in context: A019930 A123139 A027599 this_sequence A033939 A021020 A007320
Adjacent sequences: A058157 A058158 A058159 this_sequence A058161 A058162 A058163
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KEYWORD
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nonn,tabl,more
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net), Nov 14 2000
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