The number of 321-avoiding linear extensions of the comb poset K_{3,n}^beta.
A275941
The number of 321-avoiding linear extensions of the comb poset K_{3,n}^beta.
Terms
- a(0) =1a(1) =12a(2) =127a(3) =1222a(4) =11096a(5) =97140a(6) =830152a(7) =6977918a(8) =57968938a(9) =477479647a(10) =3908025133a(11) =31832823274a(12) =258341395508
External references
- oeis: A275941