# A068548 (b-file synthesized from sequence entry)
1 1
2 32
3 400
4 3584
5 26880
6 180224
7 1118208
8 6553600
9 36765696
10 199229440
11 1049624576
12 5402263552
13 27262976000
14 135291469824
15 661693399040
16 3195455668224
17 15260018802688
18 72155450572800
19 338168545017856