# A093842 (b-file synthesized from sequence entry)
1 2
2 8
3 24
4 264
5 1320
6 22440
7 157080
8 2356200
9 18849600
10 339292800
11 3053635200
12 174057206400
13 2262743683200
14 61094079446400
15 855317112249600
16 25659513367488000
17 821104427759616000
18 13137670844153856000