[0,0,2,4,16,36,128,440,1706,6560,24576,90046, 327680,1197824,4438966,16645120,62914560, 238609052,905969664,3442670796,13102206738, 49977704448,191126044672,732649663000, 2814062572336,10825960652800,41705086880768, 160862475611574]