Number of 321-avoiding extensions of comb K_{s,2}^{alpha}.
A234282
Number of 321-avoiding extensions of comb K_{s,2}^{alpha}.
Terms
- a(0) =1a(1) =3a(2) =13a(3) =67a(4) =378a(5) =2244a(6) =13737a(7) =85767a(8) =542685a(9) =3466515a(10) =22298796a(11) =144210388a(12) =936575968
External references
- oeis: A234282