# A121125 (b-file synthesized from sequence entry)
2 1
3 4
4 19
5 123
6 834
7 5796
8 40014
9 274590
10 1867320
11 12600360
12 84407832
13 561852936
14 3718716480
15 24488941248
16 160538000544
17 1048121604576
18 6817684235904
19 44197394428800
20 285637390727040
21 1840774252406400
22 11831735032492032
23 75865287873171456
24 485355033432322560