# A024338 (b-file synthesized from sequence entry)
0 0
1 0
2 1
3 -3
4 15
5 -80
6 542
7 -4158
8 37228
9 -374592
10 4237120
11 -53017712
12 729890528
13 -10957004864
14 178355968576
15 -3129133077376
16 58889303575296
17 -1183497066823680
18 25300855990394880
19 -573326855846475776