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A201690 Number of permutations avoiding the pattern 123 (with a dot over the 3). 1

%I #12 Nov 25 2018 13:10:12

%S 1,1,2,7,35,218,1598

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

%H J.-L. Baril, <a href="http://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p178">Classical sequences revisited with permutations avoiding dotted pattern</a>, Electronic Journal of Combinatorics, 18 (2011), #P178.

%Y Cf. A201691.

%K nonn,more

%O 1,3

%A _N. J. A. Sloane_, Dec 03 2011

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Last modified May 14 17:50 EDT 2024. Contains 372533 sequences. (Running on oeis4.)