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A111586 G.f.: -x*(1+x+x^2+2*x^3+3*x^4+3*x^5+x^6-x^7-x^9)/((1+x)*(-1+2*x+x^3)). 1
0, 1, 2, 5, 12, 28, 62, 136, 299, 661, 1456, 3213, 7085, 15628, 34467, 76021, 167668, 369805, 815629, 1798928, 3967659, 8750949, 19300824, 42569309, 93889565, 207079956, 456729219, 1007348005, 2221775964, 4900281149, 10807910301, 23837596568, 52575474283, 115958858869 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

V. Vatter, The Enumeration and Structure of Permutation Classes, Ph. D. Dissertation, Rutgers Univ., Math. Dept., 2006.

LINKS

Table of n, a(n) for n=0..33.

Index entries for linear recurrences with constant coefficients, signature (1,2,1,1).

CROSSREFS

Sequence in context: A228638 A202604 A118898 * A192657 A006979 A019301

Adjacent sequences:  A111583 A111584 A111585 * A111587 A111588 A111589

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Nov 17 2005

STATUS

approved

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Last modified February 23 18:54 EST 2018. Contains 299586 sequences. (Running on oeis4.)