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

Author

Christian G. Bower, Nov 14 2000

Keywords

• nonn
• tabl
• more

Examples

			1; 1,1; 1,3,1; 2,9,6,2; 1,28,31,18,6; ...
		

Links

• Index entries for sequences related to monoids

Crossrefs

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