# A302611 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 3
4 16
5 50
6 368
7 1764
8 16896
9 109584
10 1297152
11 10628640
12 149944320
13 1486442880
14 24349317120
15 283465647360
16 5287713177600
17 70734282393600
18 1480103564083200
19 22376988058521600
20 519000166327910400
21 8752948036761600000
22 222845873874075648000
23 4148476779335454720000