# A012051 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 5
5 16
6 61
7 216
8 937
9 -1280
10 -34919
11 -1141504
12 -13257619
13 -263392128
14 -3269873515
15 -64804059904
16 -890367567919
17 -18858549039104
18 -286428853272143
19 -6592583427379200
20 -109915623105978539