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A228711 as a simple table

na(n)
01
12
2-5
322
4-115
5646
6-3822
723496
8-148368
9955822
10-6256273
1141480668
12-277954706
131879118354
14-12800031737
1587758481546
16-605091552753
174192829686338
18-29180958305391
19203887504096188
20-1429568781831693
2110055261467844862
22-70929518958227340

[1,2,-5,22,-115,646,-3822,23496,-148368,955822,
 -6256273,41480668,-277954706,1879118354,
 -12800031737,87758481546,-605091552753,
 4192829686338,-29180958305391,203887504096188,
 -1429568781831693,10055261467844862,
 -70929518958227340]