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A338223 as a simple table

na(n)
21
34
412
530
668
7144
8289
9556
101034
111868
123292
135678
149608
1515984
1626188
1742314
1867509
19106460
20166090
21256552
22392628
23595696
24896484
251338894
261985298
272923840
284278448
296222518
308997544
3112938368
3218507297
3326340040
3437307326
3552597320
3673825504
37103180702

[1,4,12,30,68,144,289,556,1034,1868,3292,5678,
 9608,15984,26188,42314,67509,106460,166090,256552,
 392628,595696,896484,1338894,1985298,2923840,
 4278448,6222518,8997544,12938368,18507297,
 26340040,37307326,52597320,73825504,103180702]