A294754 - OEIS

%I #9 Mar 21 2021 21:20:25

%S 1,1,2,6,21,72,205,396,400,185

%N Number of permutations of [n] avoiding {4321, 4123, 1234}.

%H D. Callan, T. Mansour, <a href="http://arxiv.org/abs/1705.00933">Enumeration of small Wilf classes avoiding 1324 and two other 4-letter patterns</a>, arXiv:1705.00933 [math.CO] (2017), Table 2 No 39.

%K nonn,easy,fini,full

%O 0,3

%A _R. J. Mathar_, Nov 08 2017