[3,1,2,6,18,58,186,594,1898,6390,21402,71350, 237522,824130,2840594,9735090,33326370,117518870, 412260450,1439364870,5017074450,17912831754, 63634522842,225032003602,794803982874, 2859133321638,10244767026810,36572931177942]