# A003614 (b-file synthesized from sequence entry)
1 2
2 24
3 72
4 144
5 1584
6 32544
7 30528
8 188928
9 4030848
10 12029184
11 66104064
12 524719872
13 2364433920
14 28794737664
15 194617138176
16 962354727936
17 6901447938048
18 112061234884608
19 366020989931520
20 2592919032274944
21 19913392024584192