# A009783 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 -3
4 12
5 15
6 -375
7 819
8 13888
9 -108483
10 -551925
11 13545961
12 -22418484
13 -1621656517
14 14484838277
15 186206989903
16 -4523278283040
17 -3719219044807
18 1200472177117815
19 -10141780669451755
20 -290942811953148500