34 search results - page 1 / 7 » On the Number of Permutations Avoiding a Given Pattern |
COMBINATORICS
1999
14 years 6 months ago
1999
Abstract. Consider, for a permutation Sk, the number F(n, ) of permutations in Sn which avoid as a subpattern. The conjecture of Stanley and Wilf is that for every there is a c...
JCT
2000
14 years 6 months ago
2000
COMBINATORICS
1999
14 years 6 months ago
1999
We find, in the form of a continued fraction, the generating function for the number of (132)-avoiding permutations that have a given number of (123) patterns, and show how to ext...
COMBINATORICS
2002
14 years 6 months ago
2002
We consider permutations that avoid the pattern 1324. By studying the generating tree for such permutations, we obtain a recurrence formula for their number. A computer program pr...
COMBINATORICS
2006
14 years 6 months ago
2006
We present an algorithm for finding a system of recurrence relations for the number of permutations of length n that satisfy a certain set of conditions. A rewriting of these rela...