2,1
J. P. McSorley, Counting structures in the Moebius ladder, Discrete Math., 184 (1998), 137-164.
Sequence in context: A146453 A146046 A048508 * A058319 A095089 A106922
Adjacent sequences: A020876 A020877 A020878 * A020880 A020881 A020882
nonn,easy,more
N. J. A. Sloane (njas(AT)research.att.com).