1,3

Andreas Distler and Tom Kelsey, The Monoids of Order Eight and Nine, in Intelligent Computer Mathematics, Lecture Notes in Computer Science, Volume 5144/2008, Springer-Verlag.

Cf. A001423, A058133.

Sequence in context: A056288 A056283 A101604 this_sequence A084652 A002774 A150905

Adjacent sequences: A151820 A151821 A151822 this_sequence A151824 A151825 A151826

nonn

N. J. A. Sloane (njas(AT)research.att.com), Jul 10 2009