[1,2,6,16,45,120,336,920,2574,7190,20262,57192, 162318,461622,1317165,3766096,10792399,30980862, 89084844,256524560,739658472,2135213982, 6170505665,17849399616,51679366125,149750549260, 434260826883,1260197855532,3659410074932]