# A124191 (b-file synthesized from sequence entry)
1 0
2 3
3 12
4 90
5 528
6 3372
7 20880
8 130728
9 815232
10 5091120
11 31777728
12 198386592
13 1238434560
14 7731150528
15 48262685952
16 301286851200
17 1880825008128
18 11741315949312
19 73296813911040
20 457565678934528
21 2856418110492672
22 17831591947054080
23 111316221335113728