# A373740 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 3
4 3
5 30
6 105
7 315
8 2625
9 11340
10 57645
11 467775
12 2505195
13 17027010
14 142026885
15 922296375
16 7493911425
17 65886420600
18 503693415225
19 4625660914875
20 43369908657075
21 379618464975750
22 3824934458169825
23 38406952928819475
24 376103907454500225