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A253950 Number of finite, negative, totally ordered monoids of size n (semi-groups with a neutral element that is also the top element). 2
1, 1, 2, 8, 44, 308, 2641, 27120, 332507 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

M. Petrík and T. Vetterlein. The elementary extensions of finite, negative tomonoids. Submitted.

LINKS

Table of n, a(n) for n=1..9.

M. Petrík and T. Vetterlein, Program code in Python and other information

M. Petrík and T. Vetterlein, The elementary extensions of finite, negative tomonoids, preprint, 2014.

M. Petrík and T. Vetterlein, Algorithm to generate the Archimedean, finite, negative tomonoids, preprint 2014.

M. Petrík and T. Vetterlein, Algorithm to generate the Archimedean, finite, negative tomonoids, In Joint 7th International Conference on Soft Computing and Intelligent Systems and 15th International Symposium on Advanced Intelligent Systems, pages 42-47, Kitakyushu, Japan, December 2014.

Index entries for sequences related to monoids

CROSSREFS

Cf. A058129, A030453, A253948, A253949.

Sequence in context: A191810 A172109 A005649 * A212913 A321628 A005363

Adjacent sequences:  A253947 A253948 A253949 * A253951 A253952 A253953

KEYWORD

hard,nonn

AUTHOR

Milan Petrík, Jan 20 2015

STATUS

approved

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Last modified June 16 14:56 EDT 2019. Contains 324152 sequences. (Running on oeis4.)