# A009387 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -2
4 10
5 16
6 -232
7 -272
8 10064
9 7936
10 -720384
11 -353792
12 78009600
13 22368256
14 -11977120768
15 -1903757312
16 2480763381760
17 209865342976
18 -666957211828224
19 -29088885112832
20 225809770695098368
21 4951498053124096