# A140770 (b-file synthesized from sequence entry) 1 1 2 16 3 289 4 4624 5 67081 6 902500 7 11471769 8 139570596 9 1640493009 10 18754206916 11 209576262025 12 2298031637476 13 24798178969729 14 263962539461776 15 2776718023652329 16 28909790108979264 17 298278580556192769 18 3052900712959977636 19 31023767417676585561 20 313247762072931012804