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- W1483263154 abstract "Let $E_n^r={[tau]_a=(tau_1^{(a_1)},...,tau_n^{(a_n)})| tauin S_n, 1leq a_ileq r}$ be the set of all signed permutations on the symbols 1,2,...,n with signs 1,2,...,r. We prove, for every 2-letter signed pattern $[tau]_a$, that the number of $[tau]_a$-avoiding signed permutations in $E_n^r$ is given by the formula $sumlimits_{j=0}^n j!(r-1)^j{nchoose j}^2$. Also we prove that there are only one Wilf class for r=1, four Wilf classes for r=2, and six Wilf classes for $rgeq 3$." @default.
- W1483263154 created "2016-06-24" @default.
- W1483263154 creator A5024416044 @default.
- W1483263154 date "2000-11-12" @default.
- W1483263154 modified "2023-09-23" @default.
- W1483263154 title "Restricted single or double signed patterns" @default.
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