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A007440 as a simple table

na(n)
11
2-1
30
42
5-3
6-1
711
8-15
9-13
1077
11-86
12-144
13595
14-495
15-1520
164810
17-2485
18-15675
1939560
20-6290
21-159105
22324805
2387075
24-1592843
252616757
262136539
27-15726114
2820247800
2932296693
30-152909577
31145139491
32417959049
33-1460704685
34885536173
354997618808
36-13658704994

[1,-1,0,2,-3,-1,11,-15,-13,77,-86,-144,595,-495,
 -1520,4810,-2485,-15675,39560,-6290,-159105,
 324805,87075,-1592843,2616757,2136539,-15726114,
 20247800,32296693,-152909577,145139491,417959049,
 -1460704685,885536173,4997618808,-13658704994]