# A319578 (b-file synthesized from sequence entry)
0 1
1 10
2 140
3 2310
4 42042
5 816816
6 16628040
7 350574510
8 7595781050
9 168212023980
10 3792416540640
11 86787993910800
12 2011383287449200
13 47123837020238400
14 1114478745528638160
15 26575401262863040830
16 638330716607984804250
17 15431925043610580004500
18 375239440534109892741000