# A012639 (b-file synthesized from sequence entry)
0 1
1 -1
2 17
3 -385
4 15073
5 -1010945
6 101590513
7 -14396384769
8 2765830859457
9 -694784293696513
10 221386930443511505
11 -87298037019243856513
12 41742102489497599699873
13 -23796035609379191857799425