# A335318 (b-file synthesized from sequence entry)
1 1
2 6
3 140
4 270
5 672
6 8190
7 30240
8 332640
9 14303520
10 17428320
11 27027000
12 191711520
13 2144862720
14 3506025600
15 5943057120
16 14378364000
17 45578332800
18 288662774400
19 505159855200
20 2020639420800
21 10680522652800
22 54557264361600