# A012194 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 0
4 -3
5 4
6 69
7 136
8 -1159
9 1744
10 115081
11 652864
12 -3250827
13 16365504
14 1156388557
15 12624963456
16 -12628752143
17 910310355200
18 42394317198097
19 735663001262080
20 2830775181039853
21 125940707707991040