G.f. x^2*(1-5*x)/(1-12*x+15*x^2-2*x^3).

Terms

a(0) =0a(1) =1a(2) =7a(3) =69a(4) =725a(5) =7679a(6) =81411a(7) =863197a(8) =9152557a(9) =97045551a(10) =1028984651a(11) =10910437661a(12) =115684573269