# A012409 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 0
4 -16
5 -60
6 -40
7 336
8 -2560
9 -20976
10 342688
11 4002944
12 -24866048
13 -523996096
14 3812202368
15 103065059072
16 -777384271872
17 -26888473739008
18 196597142376960
19 8734488670474240
20 -63053651090673664