# A012947 (b-file synthesized from sequence entry)
0 1
1 -4
2 72
3 -3318
4 283640
5 -38913946
6 7833273228
7 -2173778522118
8 795497453081936
9 -371167668444757618
10 215062106038617789684
11 -151501184773295673275454
12 127516166752654555516090424