# A323019 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 8
4 20
5 40
6 120
7 520
8 1560
9 8840
10 26520
11 185640
12 769080
13 5383560
14 28455960
15 199191720
16 1166694360
17 8166860520
18 61834801080
19 432843607560
20 3771922865880
21 26403460061160
22 275350369209240
23 1927452584464680
24 21201978429111480
25 171543280017356520