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A157748 as a simple table

na(n)
01
1-2
25
3-12
430
5-73
6180
7-444
81095
9-2699
106653
11-16399
1240421
13-99632
14245580
15-605324
161492048
17-3677712
189065100
19-22344336
2055075988
21-135755408
22334620068
23-824796535
242033020102
25-5011139791
2612351831632
27-30445717146

[1,-2,5,-12,30,-73,180,-444,1095,-2699,6653,
 -16399,40421,-99632,245580,-605324,1492048,
 -3677712,9065100,-22344336,55075988,-135755408,
 334620068,-824796535,2033020102,-5011139791,
 12351831632,-30445717146]