# A161743 (b-file synthesized from sequence entry)
3 1
4 10
5 73
6 425
7 1561
8 -2856
9 -73520
10 380160
11 15376416
12 -117209664
13 -7506967104
14 72162155520
15 7045087741056
16 -80246202992640
17 -11448278791372800
18 149576169325363200
19 30017051616972275712
20 -440857664887810867200