# A285018 (b-file synthesized from sequence entry)
0 1
1 6
2 24
3 432
4 10368
5 6912
6 248832
7 1492992
8 23887872
9 1289945088
10 15479341056
11 30958682112
12 2229025112064
13 13374150672384
14 5944066965504
15 106993205379072
16 10271347716390912
17 20542695432781824
18 2218611106740436992
19 13311666640442621952
20 106493333123540975616