# A013198 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 -2
4 12
5 -32
6 72
7 152
8 -3808
9 48448
10 -333440
11 289408
12 26461952
13 -393649024
14 4126861312
15 -34249082624
16 -93963415552
17 12871254335488
18 -272828216803328
19 2591959365570560
20 6130847346393088