# A051452 (b-file synthesized from sequence entry)
1 2
2 3
3 7
4 13
5 61
6 421
7 841
8 2521
9 27721
10 360361
11 720721
12 12252241
13 232792561
14 5354228881
15 26771144401
16 80313433201
17 2329089562801
18 72201776446801
19 144403552893601
20 5342931457063201
21 219060189739591201