# A208651 (b-file synthesized from sequence entry)
1 1
2 2
3 12
4 216
5 11520
6 1800000
7 816480000
8 1067311728000
9 3996990937497600
10 42672954793151692800
11 1293547461212160000000000
12 110950032218933108678400000000
13 26847804299643702075375747072000000