# A261206 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 6
5 12
6 36
7 132
8 144
9 156
10 900
11 3600
12 4032
13 7140
14 18360
15 44100
16 46440
17 4062240
18 9147600
19 999999000000