# A121752 (b-file synthesized from sequence entry)
1 1
2 2
3 7
4 39
5 235
6 1746
7 14166
8 132408
9 1341432
10 15148080
11 183764880
12 2435607360
13 34406268480
14 523839899520
15 8444375452800
16 145266278169600
17 2631329637350400
18 50481429165619200
19 1015073771517388800