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A068396 as a simple table

na(n)
10
20
30
40
50
6-18
7-54
8-72
9-9
10-63
1118
12-36
1327
149
15-27
1618
17-36
1845
19-9
2054
2136
22-18
2345
24-9
2518
260
27-198
28-594
29-792
30-198
31-594
320
33-594
34-792
35-792
360
37-594
38-198
39-594
40-198
41-792
420
430
44-198
45-594
46-792
4799
48-99
49-495

[0,0,0,0,0,-18,-54,-72,-9,-63,18,-36,27,9,-27,18,
 -36,45,-9,54,36,-18,45,-9,18,0,-198,-594,-792,
 -198,-594,0,-594,-792,-792,0,-594,-198,-594,-198,
 -792,0,0,-198,-594,-792,99,-99,-495]