# A290027 (b-file synthesized from sequence entry)
1 0
2 0
3 3
4 102
5 900
6 5160
7 23520
8 92736
9 330624
10 1094400
11 3421440
12 10222080
13 29432832
14 82188288
15 223641600
16 595230720
17 1554186240
18 3990749184
19 10097197056
20 25214976000
21 62234296320
22 151993712640
23 367691563008
24 881823055872
25 2098200576000
26 4956409036800