Bending a piece of wire of length n+1 (configurations that can only be brought into coincidence by turning the figure over are counted as different).

A001444

Bending a piece of wire of length n+1 (configurations that can only be brought into coincidence by turning the figure over are counted as different).

Terms

    a(0) =1a(1) =2a(2) =6a(3) =15a(4) =45a(5) =126a(6) =378a(7) =1107a(8) =3321a(9) =9882a(10) =29646a(11) =88695a(12) =266085a(13) =797526a(14) =2392578a(15) =7175547a(16) =21526641a(17) =64573362a(18) =193720086a(19) =581140575a(20) =1743421725a(21) =5230206126a(22) =15690618378a(23) =47071677987a(24) =141215033961a(25) =423644570442

External references