# A013217 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 3
4 -6
5 23
6 -90
7 91
8 2520
9 -37549
10 461160
11 -5366339
12 58528008
13 -607263295
14 5930324400
15 -49004509553
16 192095423520
17 4873161825335
18 -189700932165696
19 4680846631063441
20 -99367558621150840
21 1935131558912511581