# A009310 (b-file synthesized from sequence entry)
0 0
1 1
2 -2
3 9
4 -51
5 384
6 -3506
7 38126
8 -479770
9 6872392
10 -110410296
11 1967181840
12 -38502498592
13 821352161200
14 -18969587297792
15 471608373782864
16 -12558441874756176
17 356636706706414848
18 -10759204665600245888