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) =3a(4) =5a(5) =8a(6) =15a(7) =23a(8) =43a(9) =71a(10) =128a(11) =209a(12) =379a(13) =650a(14) =1145a(15) =1928a(16) =3422a(17) =5908a(18) =10295a(19) =17530a(20) =30738a(21) =53088a(22) =91971a(23) =157194a(24) =273621a(25) =471865a(26) =814557a(27) =1393822a(28) =2414895a(29) =4157492