# A009487 (b-file synthesized from sequence entry)
0 0
1 1
2 -1
3 2
4 -6
5 16
6 0
7 -736
8 12208
9 -169784
10 2318040
11 -32444776
12 472825056
13 -7215401192
14 115478109656
15 -1937542156096
16 34035113079360
17 -624767330011904
18 11958852841719552
19 -238135073165940736
20 4920755077661248000