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%I #8 Oct 08 2020 18:49:34
%S 1,6,466,10614362
%N Number of Abelian hypergroups of order n.
%D R. Bayon and N. Lygeros, Les hypergroupes d'ordre 3, Italian Journal of Pure and Applied Mathematics, Vol. 20 (2006), pp. 223-236.
%D R. Bayon and N. Lygeros, Les hypergroupes abeliens d'ordre 4, Structure elements of hyper-structures, Spanidis, Xanthi (2006),pp. 35-39.
%H R. Bayon, N. Lygeros, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL11/Bayon/bayon4.html">The hyperrings of order 3</a>, JIS 11 (2008) 08.3.2.
%H Mahdeyeh Iranmanesh, Morteza Jafarpour, Hossien Aghabozorgi, Jian Ming Zhan, <a href="https://doi.org/10.1007/s10114-020-8282-z">Classification of Krasner Hyperfields of Order 4</a>, Acta Mathematica Sinica, English Series (2020) Vol. 36, No. 8, 889-902.
%Y Cf. A108089.
%K hard,nonn
%O 1,2
%A Roman Bayon (roman.bayon(AT)gmail.com), Aug 28 2007