[0,2,8,26,80,242,728,2186,6560,19682,59048,177146, 531440,1594322,4782968,14348906,43046720, 129140162,387420488,1162261466,3486784400, 10460353202,31381059608,94143178826,282429536480, 847288609442,2541865828328,7625597484986, 22876792454960]