cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A058130 Number of asymmetric monoids (semigroups with identity) of order n.

Original entry on oeis.org

1, 2, 4, 19, 128, 1344, 20997, 1479686
Offset: 1

Views

Author

Christian G. Bower, Nov 13 2000

Keywords

Links

Crossrefs

a(n)=A058136(n)*2-A058135(n).

Extensions

a(8) from Christian G. Bower, Dec 26 2006

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

Views

Author

Christian G. Bower, Nov 13 2000

Keywords

Links

Crossrefs

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

A058151 Triangle: Number of asymmetric self-converse monoids of order n with k idempotents.

Original entry on oeis.org

1, 1, 1, 0, 3, 1, 0, 6, 6, 1, 0, 12, 25, 15, 2, 0, 62, 105, 104, 45, 6, 0, 676, 562, 658, 457, 168, 24, 0
Offset: 1

Views

Author

Christian G. Bower, Nov 14 2000

Keywords

Examples

			1; 1,1; 0,3,1; 0,6,6,1; 0,12,25,15,2; ...

Links

Crossrefs

Row sums give A058135.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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