# A009615 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 2
4 0
5 -8
6 -32
7 184
8 1984
9 -5568
10 -118016
11 231552
12 8529920
13 -11751296
14 -754714880
15 596164352
16 79868821504
17 -4342886400
18 -9749056634880
19 -10035384119296
20 1296267479826432
21 3825733461393408
22 -165153529347768320