Number of symmetric linked diagrams with n links and no simple link.

A271218

Number of symmetric linked diagrams with n links and no simple link.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =3a(4) =12a(5) =39a(6) =167a(7) =660a(8) =3083a(9) =13961a(10) =70728a(11) =355457a(12) =1936449a(13) =10587960a(14) =61539129a(15) =361182139a(16) =2224641540a(17) =13880534119a(18) =90090083047a(19) =593246514588

External references