# A338810 (b-file synthesized from sequence entry)
1 0
2 1
3 6
4 28
5 170
6 988
7 7896
8 60492
9 555264
10 5819904
11 61776000
12 725950080
13 9894493440
14 137963243520
15 1875645434880
16 33258387456000
17 528975488563200
18 9760969019289600
19 175565885864140800
20 3608256006957772800
21 72367669059194880000
22 1745463407406243840000