# A013081 (b-file synthesized from sequence entry)
0 0
1 2
2 -3
3 10
4 -50
5 348
6 -2984
7 30392
8 -362704
9 4961296
10 -76245664
11 1300812544
12 -24422250368
13 500336707648
14 -11103109689216
15 265322822941056
16 -6793379754870784
17 185540068027414784
18 -5384094013002699264