OFFSET
0,3
LINKS
Darla Kremer and Wai Chee Shiu, Finite transition matrices for permutations avoiding pairs of length four patterns, Discrete Math. 268 (2003), 171-183. MR1983276 (2004b:05006). See Table 1.
EXAMPLE
There are 22 permutations of length 4 which avoid these two patterns, so a(4)=22.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Vincent Vatter, Sep 21 2009
EXTENSIONS
The 6th term should be 381, not 3381. Sorry about that. - Vincent Vatter, Oct 01 2010
a(0)=1 prepended by Alois P. Heinz, Dec 09 2015
a(13)-a(15) from Lars Blomberg, Apr 26 2018
STATUS
approved