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Search: id:A058157
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| A058157 |
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Triangle: Labeled monoids of order n with k idempotents. |
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+0
3
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| 1, 2, 2, 3, 18, 12, 16, 180, 288, 140, 30, 2640, 6540, 8380, 3020, 480, 119610, 238200, 421020, 372360, 100362, 840, 25196052, 13786290, 26803000, 36174600, 22822674, 4768624, 22080
(list; table; graph; listen)
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OFFSET
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1,2
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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; 2,2; 3,18,12; 16,180,288,140; 30,2640,6540,8380,3020; ...
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CROSSREFS
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a(n, k)=A058158(n, k)*n. Row sums give A058153. Column 1: A034383.
Sequence in context: A049009 A101817 A058159 this_sequence A049132 A087768 A113604
Adjacent sequences: A058154 A058155 A058156 this_sequence A058158 A058159 A058160
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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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