# A009630 (b-file synthesized from sequence entry)
0 1
1 4
2 16
3 -104
4 -5504
5 -69376
6 5144192
7 431779328
8 3270959104
9 -2994808352768
10 -327470564016128
11 13424788329791488
12 9902586724481662976
13 1141033124277100085248
14 -243917918992354704359424