The number of 321-avoiding linear extensions of the comb poset K_{4,n}^beta.
A275942
The number of 321-avoiding linear extensions of the comb poset K_{4,n}^beta.
Terms
- a(0) =1a(1) =55a(2) =1866a(3) =49523a(4) =1147175a(5) =24446239a(6) =492996938a(7) =9566197039a(8) =180473841477
External references
- oeis: A275942