# A308700 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 18
4 112
5 600
6 2976
7 14112
8 65024
9 293760
10 1308160
11 5761536
12 25153536
13 109025280
14 469704704
15 2013143040
16 8589672448
17 36506664960
18 154617643008
19 652832538624
20 2748773826560
21 11544861081600
22 48378488553472
23 202310091276288
24 844424829468672
25 3518436999168000