A132590 Number of Abelian hypergroups of order n.

1, 6, 466, 10614362

Offset

1,2

References

R. Bayon and N. Lygeros, Les hypergroupes d'ordre 3, Italian Journal of Pure and Applied Mathematics, Vol. 20 (2006), pp. 223-236.

R. Bayon and N. Lygeros, Les hypergroupes abeliens d'ordre 4, Structure elements of hyper-structures, Spanidis, Xanthi (2006),pp. 35-39.

Links

Table of n, a(n) for n=1..4.

R. Bayon, N. Lygeros, The hyperrings of order 3, JIS 11 (2008) 08.3.2.

Mahdeyeh Iranmanesh, Morteza Jafarpour, Hossien Aghabozorgi, Jian Ming Zhan, Classification of Krasner Hyperfields of Order 4, Acta Mathematica Sinica, English Series (2020) Vol. 36, No. 8, 889-902.

Crossrefs

Cf. A108089.

Sequence in context: A051735 A024084 A332146 * A112945 A220865 A080295

Adjacent sequences: A132587 A132588 A132589 * A132591 A132592 A132593

Keyword

hard,nonn

Author

Roman Bayon (roman.bayon(AT)gmail.com), Aug 28 2007

Status

approved