[0,1,1,3,7,20,56,182,589,2088,7522,28820,113092, 464477,1955760,8541860,38215077,176316928, 832181774,4033814912,19973824386,101257416701, 523648869394,2765873334372,14883594433742, 81646343582385,455752361294076,2589414185398032]