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).

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

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