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A121670 as a simple table

na(n)
00
1-2
22
318
452
5110
6198
7322
8488
9702
10970
111298
121692
132158
142702
153330
164048
174862
185778
196802
207940
219198
2210582
2312098
2413752
2515550
2617498
2719602
2821868
2924302
3026910
3129698
3232672
3335838
3439202
3542770
3646548
3750542
3854758
3959202
4063880
4168798
4273962

[0,-2,2,18,52,110,198,322,488,702,970,1298,1692,
 2158,2702,3330,4048,4862,5778,6802,7940,9198,
 10582,12098,13752,15550,17498,19602,21868,24302,
 26910,29698,32672,35838,39202,42770,46548,50542,
 54758,59202,63880,68798,73962]