A058144 Triangle: Self-converse monoids of order n with k idempotents.

1, 1, 1, 1, 3, 1, 2, 9, 6, 2, 1, 28, 31, 18, 6, 2, 131, 160, 132, 65, 19, 1, 1081, 947, 917, 612, 275, 68, 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; 1,3,1; 2,9,6,2; 1,28,31,18,6; ...

Crossrefs

Row sums give A058132. Main diagonal: A058122(n-1). Columns 1-3: A000001, A058145, A058146.

Sequence in context: A074308 A237186 A058142 * A378813 A132323 A305097

Adjacent sequences: A058141 A058142 A058143 * A058145 A058146 A058147

Keyword

nonn,tabl,more

Author

Christian G. Bower, Nov 14 2000

Status

approved