# A203151 (b-file synthesized from sequence entry)
1 1
2 2
3 5
4 12
5 40
6 132
7 564
8 2400
9 12576
10 65760
11 408960
12 2540160
13 18299520
14 131725440
15 1079205120
16 8836853760
17 81157386240
18 745047797760
19 7582159872000
20 77138417664000
21 861690783744000
22 9623448705024000
23 117074735382528000