# A370774 (b-file synthesized from sequence entry)
1 1
2 4
3 18
4 144
5 600
6 3600
7 44100
8 78400
9 635040
10 254016
11 12806640
12 153679680
13 1855133280
14 8657288640
15 16232416200
16 519437318400
17 8339854723200
18 150117385017600
19 541923759913536
20 516117866584320