# A047755 (b-file synthesized from sequence entry) 0 0 1 0 2 1 3 5 4 26 5 133 6 708 7 3861 8 21604 9 123266 10 715221 11 4206956 12 25032840 13 150413348 14 911379384 15 5562367173 16 34164355848 17 211015212580 18 1309815397995 19 8166460799805 20 51120054233490 21 321156223592865 22 2024257417812240 23 12797201858645100