# A177700 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 -3
4 0
5 -10
6 160
7 -756
8 2688
9 -27504
10 341248
11 -3113440
12 29004800
13 -365574144
14 5120567296
15 -69912541440
16 1009388355584
17 -16301637449728
18 281310403362816
19 -5030932957138944
20 94747161802047488
21 -1897026741117419520