OFFSET
0,3
COMMENTS
Number of irreducible indecomposable pop-stack permutations of a certain type.
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
M. D. Atkinson and T. Stitt, Restricted permutations and the wreath product, Preprint, 2002.
M. D. Atkinson and T. Stitt, Restricted permutations and the wreath product, Discrete Math., 259 (2002), 19-36.
Index entries for linear recurrences with constant coefficients, signature (9,-31,53,-44,16,-6).
MATHEMATICA
CoefficientList[Series[(x-7x^2+19x^3-21x^4+10x^5-6x^6)/(1-9x+31x^2- 53x^3+ 44x^4- 16x^5+6x^6), {x, 0, 40}], x] (* Harvey P. Dale, Aug 26 2019 *)
PROG
(PARI) concat(0, Vec((x-7*x^2+19*x^3-21*x^4+10*x^5-6*x^6)/(1-9*x+31*x^2-53*x^3+44*x^4-16*x^5+6*x^6) + O(x^50))) \\ Colin Barker, May 27 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jan 04 2003
EXTENSIONS
Replaced definition with g.f. given by Atkinson and Stitt (2002). - N. J. A. Sloane, May 24 2016
STATUS
approved