# A108124 (b-file synthesized from sequence entry)
0 0
1 1
2 -2
3 6
4 -20
5 80
6 -366
7 1904
8 -11080
9 71424
10 -505210
11 3891712
12 -32433180
13 290787328
14 -2791053734
15 28556359680
16 -310264194320
17 3567710830592
18 -43287834157938
19 552688817143808
20 -7407423764750500
21 103981459115606016
22 -1525675236649033822
23 23354749389657604096