# A013208 (b-file synthesized from sequence entry)
0 0
1 1
2 -2
3 3
4 -8
5 45
6 -272
7 1743
8 -13568
9 125625
10 -1290752
11 14554683
12 -181296128
13 2473184805
14 -36501112832
15 579439207623
16 -9859508338688
17 179018972217585
18 -3453141256896512
19 70518070842040563