# A001884 (b-file synthesized from sequence entry) 1 1 2 0 3 1 4 2 5 20 6 104 7 775 8 6140 9 55427 10 553802 11 6087992 12 72994152 13 948103477 14 13262133736 15 198769630061 16 3177862894922 17 53984653965996 18 971068821144112 19 18438722595913195 20 368558842844143268 21 7735520783692157215 22 170095060428041137778 23 3910332719957508452016 24 93806427360751009531632