# A012252 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 -1
4 -7
5 9
6 169
7 -225
8 -8751
9 11025
10 789681
11 -893025
12 -110381943
13 108056025
14 22142611737
15 -18261468225
16 -6041067843807
17 4108830350625
18 2153812782224097
19 -1187451971330625
20 -972958293249140583