# A013090 (b-file synthesized from sequence entry)
0 1
1 4
2 80
3 4120
4 394880
5 61069600
6 13845756800
7 4331363670400
8 1786609560320000
9 939754328209216000
10 613833877949676800000
11 487486352498634760960000
12 462560462591422971975680000