# A064378 (b-file synthesized from sequence entry)
0 2
1 4
2 8
3 32
4 192
5 1536
6 15360
7 184320
8 2580480
9 41287680
10 743178240
11 14863564800
12 326998425600
13 7847962214400
14 204047017574400
15 5713316492083200
16 171399494762496000
17 5484783832399872000
18 186482650301595648000
19 6713375410857443328000