# A126672 (b-file synthesized from sequence entry)
2 0
3 11
4 46
5 274
6 1956
7 16008
8 147120
9 1498320
10 16742880
11 203656320
12 2678780160
13 37888300800
14 573444748800
15 9248083891200
16 158328230860800
17 2867904245606400
18 54799402065408000
19 1101605810393088000
20 23241327926648832000
21 513476773573091328000
22 11855774776045584384000