# A124453 (b-file synthesized from sequence entry)
0 1
1 0
2 -1
3 2
4 -8
5 48
6 -378
7 3672
8 -42368
9 565760
10 -8579000
11 145590000
12 -2733455808
13 56248698240
14 -1258816278272
15 30438340438016
16 -790789409079296
17 21967629557170176
18 -649763240318538624
19 20387405315291592960
20 -676348013837480576000
21 23653682853089611520000