# A056836 (b-file synthesized from sequence entry)
0 1
1 6
2 30
3 60
4 420
5 1260
6 13860
7 27720
8 360360
9 6126120
10 116396280
11 2677114440
12 5354228880
13 26771144400
14 80313433200
15 2329089562800
16 72201776446800
17 2671465728531600
18 109530094869795600
19 4709794079401210800