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A116738 Number of permutations of length n which avoid the patterns 3214, 4123, 4132. 0
1, 2, 6, 21, 74, 260, 913, 3206, 11258, 39533, 138822, 487480, 1711809, 6011098, 21108254, 74122629, 260285106, 914003420, 3209566097, 11270542654, 39577041842, 138976648157, 488023051598, 1713715951920, 6017794352641 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
D. Callan, T. Mansour, Enumeration of small Wilf classes avoiding 1324 and two other 4-letter patterns, arXiv:1705.00933 [math.CO] (2017), Table 2 No 142.
FORMULA
G.f.: A(x) = {x(2x-1)}/{x^3-2x^2+4x-1}
CROSSREFS
Sequence in context: A116817 A116764 A294769 * A360151 A150186 A150187
KEYWORD
nonn,easy
AUTHOR
Lara Pudwell, Feb 26 2006
STATUS
approved

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Last modified March 28 09:04 EDT 2024. Contains 371240 sequences. (Running on oeis4.)