# A013421 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 3
4 0
5 -7
6 90
7 497
8 -1176
9 10649
10 185094
11 955757
12 530772
13 167741741
14 1636156522
15 18092867249
16 170829306928
17 6069742560593
18 60742435952974
19 1368824205107477
20 18173279227072940
21 584561380993184597