# A013146 (b-file synthesized from sequence entry)
0 2
1 4
2 -88
3 2496
4 -106624
5 6875136
6 -673392640
7 99550288896
8 -21279326830592
9 6159283224084480
10 -2276409633583071232
11 1031635526526543462400
12 -558671488143239984709632
13 355396466132997594824048640