# A056388 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 12
5 60
6 792
7 1404
8 10704
9 31200
10 204972
11 349956
12 3727128
13 5065804
14 41572908
15 127198968
16 517279416
17 1041517620
18 11195605728
19 15012935676
20 135825494568
21 363040468328
22 1746669815460
23 3181465294092