Four-discordant permutations
Four-discordant permutations
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四不一致排列
DOI:
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发表时间:
1979
影响因子:
0.7
通讯作者:
Earl Glen Whitehead
中科院分区:
文献类型:
--
作者:
Earl Glen Whitehead
Abstract A permutation π of the set {1, 2, …, n} is four-discordant if π(i) ≢ i, i+ 1, i + 2, i +3 (mod n) for 1 ≦i ≦ n. Generating functions for rook polynomials associated with four-discordant permutations are derived. Hit polynomials associated with four-discordant permutations are studied. Finally, it is shown that the leading coefficients of these rook polynomials form a “tribonacci” sequence which is a generalized Fibonacci sequence.