A201690 Number of permutations avoiding the pattern 123 (with a dot over the 3).

1, 1, 2, 7, 35, 218, 1598

Offset

1,3

Links

Table of n, a(n) for n=1..7.

J.-L. Baril, Classical sequences revisited with permutations avoiding dotted pattern, Electronic Journal of Combinatorics, 18 (2011), #P178.

Crossrefs

Cf. A201691.

Sequence in context: A350309 A307441 A260530 * A080831 A006947 A182224

Adjacent sequences: A201687 A201688 A201689 * A201691 A201692 A201693

Keyword

nonn,more

Author

N. J. A. Sloane, Dec 03 2011

Status

approved