A058144 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A058144

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

2

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

(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; 1,3,1; 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 * A132323 A305097 A316757

Adjacent sequences: A058141 A058142 A058143 * A058145 A058146 A058147

KEYWORD

nonn,tabl,more

AUTHOR

Christian G. Bower, Nov 14 2000

STATUS

approved