# A009771 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -1
4 10
5 -29
6 -46
7 1049
8 -5480
9 -6299
10 367784
11 -2993101
12 -433520
13 302131831
14 -3539197936
15 4643279549
16 477914976640
17 -7698953963639
18 24464869564544
19 1282442213912999
20 -27686771463968000
21 150369505621009291