# A013152 (b-file synthesized from sequence entry)
0 0
1 1
2 -2
3 3
4 -12
5 65
6 -392
7 2723
8 -23072
9 226785
10 -2475392
11 29857443
12 -397554432
13 5785047905
14 -91112993792
15 1544546456963
16 -28059800686592
17 543833037679425
18 -11198270349934592
19 244141035610073283