# A013030 (b-file synthesized from sequence entry)
0 1
1 -4
2 16
3 -88
4 1152
5 -17696
6 343424
7 -10274688
8 315332608
9 -12815815168
10 629185325056
11 -32422278027264
12 2168521319694336
13 -151839257015918592
14 12117141068938969088
15 -1135217173587531628544