%N Total number of C-rotamers with a given number of carbon atoms.
%C See Table 1 on page 3605 of Balaban and Schleyer paper.
%D A. T. Balaban and Paul von R. Schleyer, "Graph theoretical enumeration of polymantanes", Tetrahedron, (1978), vol. 34, pp. 3599 - 3609..
%e If n=5 then the total numbers of C-rotamers is 7 which is the fifth term in the sequence.
%A _Parthasarathy Nambi_, Aug 16 2006