0,1

J. P. McSorley, Counting structures in the Moebius ladder, Discrete Math., 184 (1998), 137-164.

2^n+n^2-n+1.

Adjacent sequences: A020870 A020871 A020872 this_sequence A020874 A020875 A020876

Sequence in context: A066460 A006884 A074742 this_sequence A049958 A076993 A076698

nonn

njas