1,2

The lace must follow a Hamiltonian path through the 2n eyelets and cannot pass in order though three adjacent eyelets that are in a line.

The lace is "undirected": reversing the order of eyelets along the path does not count as a different solution (cf. A078629).

Index entries for sequences related to shoe lacings

Apart from initial term, A078629/2.

Sequence in context: A034201 A099346 A075184 this_sequence A071094 A062216 A045489

Adjacent sequences: A078671 A078672 A078673 this_sequence A078675 A078676 A078677

nonn

njas, Dec 16 2002