# A126985 (b-file synthesized from sequence entry)
0 1
1 -8
2 56
3 -400
4 2840
5 -20208
6 143664
7 -1021728
8 7265240
9 -51665200
10 367392656
11 -2612584928
12 18578329456
13 -132112749920
14 939467783520
15 -6680662171200
16 47506922377560
17 -337827035002800
18 2402325467002320
19 -17083203745473120
20 121480558396908240
21 -863861754435010080