# A052606 (b-file synthesized from sequence entry)
0 1
1 2
2 16
3 180
4 2688
5 50160
6 1123200
7 29342880
8 876072960
9 29425939200
10 1098191001600
11 45083550758400
12 2019049224192000
13 97957525739673600
14 5118154482618777600
15 286518188551795200000
16 17108806991486386176000