Number of unlabeled rigid interval posets with n non-maximal and 2 maximal elements.
A194530
Number of unlabeled rigid interval posets with n non-maximal and 2 maximal elements.
Terms
- a(0) =0a(1) =1a(2) =3a(3) =9a(4) =32a(5) =132a(6) =623a(7) =3314a(8) =19628a(9) =128126a(10) =914005a(11) =7074517a(12) =59050739a(13) =528741491a(14) =5055414317a(15) =51406084221a(16) =553946196892
External references
- oeis: A194530