# A013247 (b-file synthesized from sequence entry)
0 0
1 0
2 -1
3 4
4 -6
5 0
6 -135
7 1860
8 -10780
9 48160
10 -705285
11 12356100
12 -144752850
13 1590732000
14 -25870559715
15 486296892900
16 -8228037051000
17 144968627793600
18 -3059375913585225
19 67951188182650500