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A316612 as a simple table

na(n)
18
253
363
4199
5649
61749
74719
813770
938535
10106694
11302759
12853104
132385813
146717043
1518917295
1653110690
17149304292
18420051407
191180658209
203318836197
219332768412
2226238657260
2373763895813
24207396353458
25583103500176

[8,53,63,199,649,1749,4719,13770,38535,106694,
 302759,853104,2385813,6717043,18917295,53110690,
 149304292,420051407,1180658209,3318836197,
 9332768412,26238657260,73763895813,207396353458,
 583103500176]