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A058157
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Triangle: Labeled monoids of order n with k idempotents.
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2
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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; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Index entries for sequences related to monoids
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EXAMPLE
| 1; 2,2; 3,18,12; 16,180,288,140; 30,2640,6540,8380,3020; ...
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CROSSREFS
| a(n, k)=A058158(n, k)*n. Row sums give A058153. Column 1: A034383.
Sequence in context: A049009 A101817 A058159 * A049132 A184846 A087768
Adjacent sequences: A058154 A058155 A058156 * A058158 A058159 A058160
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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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