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A058147 Triangle read by rows: number of monoids of order n with k idempotents, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator). 2
1, 1, 1, 1, 3, 2, 2, 9, 10, 6, 1, 30, 47, 52, 26, 2, 175, 283, 413, 365, 135, 1, 3333, 2139, 3630, 4597, 3155, 875, 5 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Table of n, a(n) for n=1..29.

Index entries for sequences related to monoids

EXAMPLE

1; 1,1; 1,3,2; 2,9,10,6; 1,30,47,52,26; ...

CROSSREFS

Row sums give A058133. Main diagonal: A002788(n-1). Columns 1-3: A000001, A058148, A058149.

Sequence in context: A177460 A091015 A256097 * A193344 A119954 A100804

Adjacent sequences:  A058144 A058145 A058146 * A058148 A058149 A058150

KEYWORD

nonn,tabl,more

AUTHOR

Christian G. Bower, Nov 14 2000

STATUS

approved

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Last modified June 20 13:10 EDT 2021. Contains 345164 sequences. (Running on oeis4.)