# A013242 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 0
4 -6
5 8
6 -150
7 448
8 -7560
9 38432
10 -650160
11 4827328
12 -85887648
13 855019904
14 -16230758544
15 204362847232
16 -4163699379840
17 63548399361536
18 -1392682970270592
19 24960951809133568
20 -588583828329908480