# A138740 (b-file synthesized from sequence entry)
1 1
2 1
3 -2
4 9
5 -56
6 420
7 -3572
8 33328
9 -334354
10 3559310
11 -39838760
12 465743720
13 -5658983108
14 71191948512
15 -924554859776
16 12365546196641
17 -169995491295312
18 2398380272232272
19 -34680290150700800
20 513390937937217088
21 -7773229533145403728