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A247726 as a simple table

na(n)
18
248
38
4168
590
68
7440
8456
9172
108
11960
121592
131248
14334
158
161848
174344
185796
193424
20656
218
223248
2310098
2419744
2521152
269392
271300
288
295328
3020816
3155372
3289836
3377236
3425822
352584
368
378280
3839264
39133780
40303924
41408644
42282384
4371060
445148
458
4612320

[8,48,8,168,90,8,440,456,172,8,960,1592,1248,334,
 8,1848,4344,5796,3424,656,8,3248,10098,19744,
 21152,9392,1300,8,5328,20816,55372,89836,77236,
 25822,2584,8,8280,39264,133780,303924,408644,
 282384,71060,5148,8,12320]