# A013243 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 0
4 3
5 0
6 90
7 -168
8 4725
9 -22176
10 404964
11 -3167120
12 51954903
13 -563026464
14 9315656350
15 -126730926840
16 2219178178217
17 -35798640990400
18 676619926058632
19 -12499985614160160
20 256672333451106667