# A156088 (b-file synthesized from sequence entry)
0 0
1 -1
2 8
3 -56
4 385
5 -2640
6 18096
7 -124033
8 850136
9 -5826920
10 39938305
11 -273741216
12 1876250208
13 -12860010241
14 88143821480
15 -604146740120
16 4140883359361
17 -28382036775408
18 194533374068496
19 -1333351581704065
20 9138927697859960