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A202214
Number of permutations avoiding the consecutive pattern 53421.
2
1, 2, 6, 24, 119, 708, 4914, 38977, 347779, 3447902, 37600925, 447332398, 5765327905, 80020698913, 1189991560707, 18876181370841, 318136382176708, 5677225148401090, 106939954137362482, 2120412050923152077, 44145844897844974946, 962859209130749461268
OFFSET
1,2
COMMENTS
a(n) is the number of permutations on [n] that avoid the consecutive pattern 53421. It is the same as the number of permutations which avoid 12435, 13245 or 54231.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ray Chandler, Dec 14 2011
STATUS
approved