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A206736 Number of permutations of length n which avoid the patterns 1234, 4321. 0
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, 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, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

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.

LINKS

Table of n, a(n) for n=1..113.

FORMULA

0 for n >= 10.

CROSSREFS

Begins in the same way as A079105.

Sequence in context: A150253 A150254 A148497 * A079105 A079104 A116705

Adjacent sequences:  A206733 A206734 A206735 * A206737 A206738 A206739

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 11 2012

STATUS

approved

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Last modified July 1 10:54 EDT 2022. Contains 354972 sequences. (Running on oeis4.)