A058130 -id:A058130 - cp's OEIS frontend

Showing 1-3 of 3 results.

A058135 Number of asymmetric self-converse monoids (semigroups with identity) of order n.

Original entry on oeis.org

1, 2, 4, 13, 54, 322, 2545

Offset: 1

Christian G. Bower, Nov 13 2000

Index entries for sequences related to monoids

a(n)=A058136(n)*2-A058130(n).

A058136 Number of asymmetric monoids (semigroups with identity) of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

Original entry on oeis.org

1, 2, 4, 16, 91, 833, 11771

Offset: 1

Christian G. Bower, Nov 13 2000

Index entries for sequences related to monoids

a(n)=(A058130(n)+A058135(n))/2.

A058140 Triangle read by rows: number of asymmetric monoids of order n with k idempotents.

Original entry on oeis.org

1, 1, 1, 0, 3, 1, 0, 6, 10, 3, 0, 14, 47, 55, 12, 0, 124, 267, 490, 395, 68, 0, 4510, 2230, 4460, 5971, 3324, 502, 0

Offset: 1

Christian G. Bower, Nov 14 2000

			1;
1,1;
0,3,1;
0,6,10,3;
0,14,47,55,12;
...

Index entries for sequences related to monoids

Row sums give A058130. Main diagonal: A058115(n-1). Column 2: A058141.

Showing 1-3 of 3 results.