[1,1,2,6,20,72,260,996,3772,14852,58204,234236, 934180,3825428,15493292,64009212,263052756, 1096235844,4537607788,19075092364,79566093524, 336047432420,1412387294716,5993817852300, 25302001904628,107911381154004,457634804571804]