# A013020 (b-file synthesized from sequence entry)
0 0
1 2
2 -1
3 -13
4 42
5 237
6 -2490
7 -3645
8 204344
9 -680163
10 -20955960
11 230307805
12 2174078808
13 -64281321713
14 -27511603392
15 18418436193415
16 -156659497218720
17 -5253312957895607
18 117706310429535360