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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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3
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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; refs; listen; history; internal format)
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OFFSET
| 1,5
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LINKS
| Index entries for sequences related to monoids
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EXAMPLE
| 1; 1,1; 1,6,2; 4,45,36,9; 6,408,648,348,76; ...
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CROSSREFS
| a(n, k)=A058159(n, k)/n. Row sums give A058156. Column 1: A058162. Main diagonal A058164.
Sequence in context: A169843 A123139 A027599 * A033939 A021020 A007320
Adjacent sequences: A058157 A058158 A058159 * A058161 A058162 A058163
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KEYWORD
| nonn,tabl,more
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net), Nov 14 2000
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