# A009357 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 0
4 2
5 -20
6 104
7 -560
8 2512
9 -7920
10 -32896
11 1034880
12 -14979328
13 172569280
14 -1684304896
15 12339608320
16 -15173408768
17 -1902800305920
18 53242752303104
19 -1037015219466240
20 16518488951816192
21 -208832669083243520