# A360021 (b-file synthesized from sequence entry)
3 1
4 6
5 45
6 315
7 2205
8 15624
9 111888
10 807840
11 5868720
12 42799680
13 312504192
14 2278418688
15 16549827840
16 119567831040
17 858293084160
18 6118081708032
19 43298650386432
20 304260332175360
21 2123395686236160
22 14722247331348480
23 101446590051975168
24 695007859780878336
25 4735844958575001600