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A066708 as a simple table

na(n)
13
26
315
428
5165
630
7135
848
9144
10192
111755
12300
131485
14270
152079
16336
176237
181008
199639
201728
211296
223510
2328215
241080
2516900
262970
2710395
287840
2912285
304158
3141055
324752
3340425
3412474
3548195
363780
37220077
3819278
3951975
4010920
41356265
429450

[3,6,15,28,165,30,135,48,144,192,1755,300,1485,
 270,2079,336,6237,1008,9639,1728,1296,3510,28215,
 1080,16900,2970,10395,7840,12285,4158,41055,4752,
 40425,12474,48195,3780,220077,19278,51975,10920,
 356265,9450]