%I
%S 1,2,6,22,86,306,882,1764,1764,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N Number of permutations of length n which avoid the patterns 1234, 4321.
%D Kremer, Darla; and Shiu, Wai Chee; Finite transition matrices for permutations avoiding pairs of length four patterns. Discrete Math. 268 (2003), no. 13, 171183. MR1983276 (2004b:05006). See Table 1.
%F 0 for n >= 10.
%Y Begins in the same way as A079105.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Feb 11 2012
