OFFSET
0,6
LINKS
Brian Nakamura and Doron Zeilberger, Table of n, a(n) for n = 0..70
Andrew R. Conway and Anthony J. Guttmann, Counting occurrences of patterns in permutations, arXiv:2306.12682 [math.CO], 2023. See p. 16.
Brian Nakamura and Doron Zeilberger, Using Noonan-Zeilberger Functional Equations to enumerate (in Polynomial Time!) Generalized Wilf classes; Local copy, pdf file only, no active links
Brian Nakamura and Doron Zeilberger, Using Noonan-Zeilberger Functional Equations to enumerate (in Polynomial Time!) Generalized Wilf classes, arXiv preprint arXiv:1209.2353, 2012.
Wikipedia, Enumerations of specific permutation classes
Wikipedia, Subsequence
EXAMPLE
a(4) = 1: 1234.
a(5) = 12: 12453, 12534, 13425, 13452, 14235, 15234, 23145, 23415, 23451, 31245, 41235, 51234.
MAPLE
# programs can be obtained from the Nakamura & Zeilberger link.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 25 2012
STATUS
approved