0,3

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Index entries for sequences related to semigroups

a(n)=A001423(n)*2-A027851(n). Cf. A001426.

Sequence in context: A135889 A124562 A052757 this_sequence A111262 A139134 A109577

Adjacent sequences: A029848 A029849 A029850 this_sequence A029852 A029853 A029854

nonn,hard,nice

Christian G. Bower (bowerc(AT)usa.net), Jan 27 1998. Updated Feb 19 2001