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%I #11 Aug 27 2015 09:14:29
%S 0,0,1,6,26,102,386,1441,5353,19854,73612,272940,1012137,3753696,
%T 13922343,51640040,191546040,710504359,2635506573,9776051185,
%U 36263011505,134513166002,498960289449,1850833274594,6865444733208,25466548032582
%N G.f.: x^2*(1-2*x)/(1-8*x+22*x^2-26*x^3+14*x^4-5*x^5+x^6).
%H Miklós Bóna, <a href="http://arxiv.org/abs/1404.4033">A new record for 1324-avoiding permutations</a>, arXiv:1404.4033 [math.CO], 2014.
%H Miklós Bóna, <a href="http://dx.doi.org/10.1007/s40879-014-0020-6">A new record for 1324-avoiding permutations</a>, European Journal of Mathematics (2015) 1:198-206, DOI 10.1007/s40879-014-0020-6.
%t CoefficientList[Series[x^2 (1 - 2 x)/(1 - 8 x + 22 x^2 - 26 x^3 + 14 x^4 - 5 x^5 + x^6), {x, 0, 25}], x] (* _Michael De Vlieger_, Aug 27 2015 *)
%o (PARI) concat([0, 0], Vec(x^2*(1-2*x)/(1-8*x+22*x^2-26*x^3+14*x^4-5*x^5+x^6) + O(x^40))) \\ _Michel Marcus_, Aug 27 2015
%K nonn
%O 0,4
%A _N. J. A. Sloane_, Apr 13 2015