Number of different shapes formed by bending a piece of wire of length n in the plane.

A001997

Number of different shapes formed by bending a piece of wire of length n in the plane.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =24a(6) =66a(7) =176a(8) =493a(9) =1362a(10) =3821a(11) =10660a(12) =29864a(13) =83329a(14) =232702a(15) =648182a(16) =1804901a(17) =5015725a(18) =13931755a(19) =38635673a(20) =107090666a(21) =296449133a(22) =820271143a(23) =2267225157a(24) =6264244414a(25) =17291930470

External references