# A227927 (b-file synthesized from sequence entry)
1 1
2 2
3 36
4 144
5 576
6 3600
7 14400
8 921600
9 1040400
10 4161600
11 8643600
12 34574400
13 266342400
14 700131600
15 2800526400
16 179233689600
17 202338032400
18 809352129600