Gebogen draad

"A thin, straight wire is marked off into m equal lengths by m-1 points. It is then bent at a right angle at each of one or more of these points, making each segment parallel to one of two rectangular axes. The bent wire may be self-intersecting, but not self-coincident over a finite length. How many different shapes may it have?" Ik vond deze in mijn oude, papieren Encyclopedia of Integer Sequences: M1206. Op het internet heeft ie een ander nummer gekregen: A001997.