2,2

a(5) is also the number of directed Hamiltonian cycles in the 2-Keller graph. - Eric W. Weisstein, Mar 21 2018

Table of n, a(n) for n=2..6.

Eric Weisstein's World of Mathematics, Folded Cube Graph

Eric Weisstein's World of Mathematics, Hamiltonian Cycle

Eric Weisstein's World of Mathematics, Keller Graph

Sequence in context: A307416 A133460 A166953 * A041271 A196964 A121473

Adjacent sequences: A280844 A280845 A280846 * A280848 A280849 A280850

nonn,hard,more

Eric W. Weisstein, Jan 17 2017

approved