# A195550 (b-file synthesized from sequence entry)
1 3
2 60
3 660
4 3597
5 78480
6 856080
7 4669203
8 101866380
9 1111191780
10 6060621597
11 132222483360
12 1442326073760
13 7866682164003
14 171624681534300
15 1872138132549300
16 10210947388253997
17 222768704409038640
18 2430033853722917040