Number of chainmails with n unlabeled elements.

A374174

Number of chainmails with n unlabeled elements.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =10a(5) =28a(6) =99a(7) =430a(8) =2390a(9) =17002a(10) =154831

External references