a(n) counts anti-chains of size three in "0,1,2" Motzkin trees on n edges.
A335349
a(n) counts anti-chains of size three in "0,1,2" Motzkin trees on n edges.
Terms
- a(0) =2a(1) =16a(2) =98a(3) =500a(4) =2308a(5) =9920a(6) =40522a(7) =159212a(8) =606790a(9) =2256544a(10) =8224202a(11) =29473012a(12) =104124044a(13) =363374560a(14) =1254711038a(15) =4292365876a(16) =14564351510a(17) =49059814576a(18) =164186524940a(19) =546276316120
External references
- oeis: A335349