# A082032 (b-file synthesized from sequence entry)
0 1
1 4
2 20
3 128
4 1040
5 10432
6 125248
7 1753600
8 28057856
9 505041920
10 10100839424
11 222218469376
12 5333243269120
13 138664325005312
14 3882601100165120
15 116478033004986368
16 3727297056159629312
17 126728099909427527680
18 4562211596739391258624
19 173364040676096868352000
20 6934561627043874735128576