Number of unlabeled Riordan posets with n elements.
A379608
Number of unlabeled Riordan posets with n elements.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =11a(4) =33a(5) =74a(6) =144a(7) =232a(8) =639a(9) =1406a(10) =3164a(11) =4992a(12) =12501a(13) =26973a(14) =55937
External references
- oeis: A379608