# A009364 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 3
4 -10
5 41
6 -232
7 1467
8 -11408
9 100625
10 -1000704
11 11103155
12 -135118080
13 1795927225
14 -25845415936
15 400540116971
16 -6651228620800
17 117802787966241
18 -2216949901393920
19 44174901566136419
20 -929133071750004736