# A308648 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 3
4 12
5 40
6 120
7 336
8 7168
9 58752
10 345600
11 1682560
12 15983616
13 142192128
14 2318697472
15 25614382080
16 282753361920
17 2645093410816
18 48869743454208
19 674729909839872
20 12153962014842880
21 167314499427532800
22 1986101341059956736
23 20335611320801886208