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A206736 Number of permutations of length n which avoid the patterns 1234, 4321. 0

%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. 1-3, 171-183. 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

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Last modified August 19 16:22 EDT 2022. Contains 356229 sequences. (Running on oeis4.)