# A064595 (b-file synthesized from sequence entry)
1 24
2 112
3 1984
4 2520
5 31320
6 32512
7 1163160
8 2208384
9 3053232
10 6535296
11 13472928
12 123165600
13 134201344
14 186076800
15 365959296
16 3456573120
17 4401782352
18 5517818880
19 18924364800
20 34359476224
21 325377803520