# A013397 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 -1
4 9
5 -25
6 235
7 -1125
8 12145
9 -83305
10 1037475
11 -9280225
12 132009625
13 -1456021125
14 23378099875
15 -306453818125
16 5493040502625
17 -83388492864625
18 1652566180607875
19 -28500730684349625
20 619275939126495625