
REFERENCES

R. J. Plemmons, There are 15973 semigroups of order 6, Math. Algor., 2 (1967), 217; 3 (1968), 23.
R. J. Plemmons, Construction and analysis of nonequivalent finite semigroups, pp. 223228 of J. Leech, editor, Computational Problems in Abstract Algebra. Pergamon, Oxford, 1970.
S. Satoh, K. Yama and M. Tokizawa, Semigroups of order 8; Semigroup Forum 49, 1994.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=0..10.
Andreas Distler, Classification and Enumeration of Finite Semigroups, A Thesis Submitted for the Degree of PhD, University of St Andrews (2010).
R. J. Plemmons, There are 15973 semigroups of order 6 (annotated and scanned copy)
Eric Weisstein's World of Mathematics, Semigroup.
Index entries for sequences related to semigroups


EXTENSIONS

Additional reference and comments from Michael Somos.
a(7) term from Christian G. Bower, Feb 19 2001
a(8) (from the Satoh et al. reference) sent by Tom Kelsey (tom(AT)cs.stand.ac.uk), Jun 17 2008
a(9)a(10) from Andreas Distler, Jan 12 2011
