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%I #3 May 10 2013 12:44:46
%S 0,0,1,3,11,44,185,805,3552,15671,68827,301108,1314553,5735237,
%T 25024104,109216135,476775195,2081568940,9088283129,39679791093,
%U 173240442512,756351086215,3302134987931,14416689863220,62941426366169
%N G.f.: x^2*(x-1)^8/(4*x^9+x^8-79*x^7+166*x^6-225*x^5+206*x^4-129*x^3+50*x^2-11*x+1).
%D R. P. Stanley, Enumerative Combinatorics I, 4.7.19.
%F a(n) = 11*a(n - 1) - 50*a(n - 2) + 129*a(n - 3) - 206*a(n - 4) + 225*a(n - 5) - 166*a(n - 6) + 79*a(n - 7) - a(n - 8) - 4*a(n - 9) for n >= 11.
%Y Cf. A001169.
%K nonn
%O 0,4
%A _Vladeta Jovovic_, Jun 18 2001
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