[0,0,1,3,9,25,70,200,584,1742,5304,16471,52120, 167885,549856,1828897,6170108,21087458,72923515, 254880303,899454849,3201729220,11486266036, 41497996004,150879471934,551723923040, 2027990653855,7489507917594,27777837416779, 103427750936183]