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A116743 Number of permutations of length n which avoid the patterns 3421, 4123, 4213. 0
1, 2, 6, 21, 75, 267, 950, 3384, 12065, 43034, 153524, 547744, 1954328, 6973114, 24880601, 88776363, 316763410, 1130246720, 4032847433, 14389658085, 51343944371, 183201075822, 653682454214, 2332414030833, 8322321077596 (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 179.
FORMULA
G.f.: A(x) = -{x(x^3-2x^2+3x-1)(x-1)^2}/{(x^2-x+1)(x^4-5x^3+10x^2-6x+1)}
CROSSREFS
Sequence in context: A116751 A116823 A289597 * A294816 A263790 A247416
KEYWORD
nonn,easy
AUTHOR
Lara Pudwell, Feb 26 2006
STATUS
approved

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Last modified March 19 01:34 EDT 2024. Contains 370952 sequences. (Running on oeis4.)