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A165935 as a simple table

na(n)
11
2-242
32883
4-13924
545125
6-115926
7255367
8-504008
9915849
10-1560250
112523851
12-3912492
135853133
14-8495774
1512015375
16-16613776
1722521617
18-30000258
1939343699
20-50880500

[1,-242,2883,-13924,45125,-115926,255367,-504008,
 915849,-1560250,2523851,-3912492,5853133,-8495774,
 12015375,-16613776,22521617,-30000258,39343699,
 -50880500]