# A012650 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 -3
4 0
5 -10
6 40
7 504
8 -2352
9 -4824
10 -182912
11 3899720
12 -27876640
13 234373776
14 -5435914640
15 91625675400
16 -1149581257216
17 18172484297792
18 -366469643887104
19 6826755069373824
20 -123759250799610112