# A002930 (b-file synthesized from sequence entry)
0 1
1 0
2 -2
3 -8
4 -26
5 -80
6 -268
7 -944
8 -3474
9 -13072
10 -49672
11 -191272
12 -744500
13 -2924680
14 -11596284
15 -46364456