[0,1,2,6,15,40,109,302,846,2390,6796,19426,55767, 160668,464305,1345282,3906701,11367696,33135987, 96740610,282831981,827939880,2426431239, 7118546874,20904025380,61439768166,180725813478, 532004277518]