# A013138 (b-file synthesized from sequence entry)
0 1
1 -4
2 16
3 -448
4 14592
5 -705536
6 65245184
7 -5385535488
8 910402060288
9 -124371776831488
10 30930578556583936
11 -6638266678020931584
12 2186545615284171964416
13 -694382737827711997181952