# A012882 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 0
4 -3
5 20
6 165
7 784
8 1337
9 26256
10 356745
11 4466176
12 31874997
13 435729216
14 5714452653
15 104111460608
16 1296863374193
17 23261262303488
18 357091592679441
19 7794968497086464
20 131690816886952045