Number of permutations that lie in the cyclic closure of Av(123) - i.e., at least one cyclic rotation of the permutation avoids the pattern 123.
A141254
Number of permutations that lie in the cyclic closure of Av(123) - i.e., at least one cyclic rotation of the permutation avoids the pattern 123.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =110a(6) =510a(7) =2268a(8) =9632a(9) =39492a(10) =158190a(11) =624745a(12) =2447808a(13) =9552244a(14) =37214086a(15) =144932760a(16) =564676096a(17) =2201735552a(18) =8592780798a(19) =33568042425a(20) =131261440720a(21) =513747571680
External references
- oeis: A141254