# A048120 (b-file synthesized from sequence entry)
1 0
2 0
3 2
4 6
5 24
6 84
7 312
8 1140
9 4248
10 15852
11 59688
12 225624
13 857424
14 3270216
15 12518472
16 48062520
17 185034360
18 714038448
19 2761343064
20 10698992304
21 41525207448
22 161418403008
23 628356425856
24 2449152822168
25 9557303840184