%N Order of linear recurrence for number of Hamiltonian cycles in the graph C_n X C_k as a function of k.
%H Artem M. Karavaev, <a href="https://web.archive.org/web/20161024010518/http://flowproblem.ru/cycles/hamilton-cycles">Hamilton Cycles</a>
%Y Cf. A222199.
%A _N. J. A. Sloane_, Feb 14 2013