Number of idempotents in the Motzkin monoid of degree n.
A256672
Number of idempotents in the Motzkin monoid of degree n.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =31a(4) =153a(5) =834a(6) =4839a(7) =29612a(8) =188695a(9) =1243746a(10) =8428597a(11) =58476481a(12) =413893789a(13) =2980489256a(14) =21787216989a(15) =161374041945
External references
- oeis: A256672