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A058159
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Triangle: Labeled commutative monoids of order n with k idempotents.
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4
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1, 2, 2, 3, 18, 6, 16, 180, 144, 36, 30, 2040, 3240, 1740, 380, 360, 43170, 81000, 70740, 31680, 6390, 840, 1400112, 2589510, 2976960, 2055480, 832230, 157962, 15360
(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; 3,18,6; 16,180,144,36; 30,2040,3240,1740,380; ...
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CROSSREFS
| a(n, k)=A058160(n, k)*n. Row sums give A058155. Column 1: A034382. Main diagonal: A055512.
Sequence in context: A035796 A049009 A101817 * A058157 A049132 A184846
Adjacent sequences: A058156 A058157 A058158 * A058160 A058161 A058162
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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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