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A111518 as a simple table

na(n)
01
10
2-3
3-4
47
511
6-62
7-14
8581
9-1235
10-4175
1132520
12-48359
13-443625
143136662
15-4834644
16-60319241
17506792496
18-1210299173
19-10327456109
20122982395262
21-496826354929
22-1709350378156
2339417717346686
24-259877263864213
25162788318972691
2614331409095176010

[1,0,-3,-4,7,11,-62,-14,581,-1235,-4175,32520,
 -48359,-443625,3136662,-4834644,-60319241,
 506792496,-1210299173,-10327456109,122982395262,
 -496826354929,-1709350378156,39417717346686,
 -259877263864213,162788318972691,
 14331409095176010]