# A168468 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 -3
4 8
5 -40
6 256
7 -1568
8 11108
9 -96720
10 908836
11 -9084108
12 101147408
13 -1233325600
14 15998088016
15 -221845635248
16 3301710539408
17 -52192183735680
18 871157943761296
19 -15360373687021488
20 285403775884452608