# A342933 (b-file synthesized from sequence entry)
1 1
2 9
3 80
4 654
5 6264
6 59760
7 665160
8 7565040
9 96929280
10 1286046720
11 18976083840
12 286363123200
13 4775047200000
14 81792956044800
15 1515077749785600
16 28898470215014400
17 594066352700620800
18 12467555729620992000
19 280797084422959104000
20 6460327992512249856000
21 157769680941941612544000