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A316699 as a simple table

na(n)
12
24
38
414
520
638
770
8134
9240
10442
11814
121502
132756
145070
159326
1617158
1731552
1858034
19106742
20196334
21361108
22664182
231221622
242246918
254132720
267601258
2713980894
2825714878
2947297028
3086992798

[2,4,8,14,20,38,70,134,240,442,814,1502,2756,5070,
 9326,17158,31552,58034,106742,196334,361108,
 664182,1221622,2246918,4132720,7601258,13980894,
 25714878,47297028,86992798]