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A007312 as a simple table

na(n)
11
2-2
35
4-15
552
6-200
7825
8-3565
915900
10-72532
11336539
12-1582593
137524705
14-36111810
15174695712
16-851020367
174171156249
18-20555470155
19101787990805
20-506227992092
212527493643612
22-12663916942984
2363656297034920
24-320914409885850
251622205233276889

[1,-2,5,-15,52,-200,825,-3565,15900,-72532,336539,
 -1582593,7524705,-36111810,174695712,-851020367,
 4171156249,-20555470155,101787990805,
 -506227992092,2527493643612,-12663916942984,
 63656297034920,-320914409885850,1622205233276889]