# A009212 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 33
5 137
6 619
7 3017
8 15617
9 84625
10 474771
11 2723721
12 15730209
13 89487257
14 482793211
15 2259370697
16 6292321025
17 -41172399839
18 -1066104760797
19 -14517156416247
20 -163539106749663
21 -1652237279663959
22 -15169567281615221