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A234250 as a simple table

na(n)
20
316
4111
5439
61305
73240
87091
914126
1026154
1145660
1275955
13121341
14187291
15280644
16409815
17585020
18818516
191124856
201521159
212027395
222666685
233465616
244454571
255668074
267145150
278929700
2811070891
2913623561
3016648639
3120213580
3224392815
3329268216
3434929576

[0,16,111,439,1305,3240,7091,14126,26154,45660,
 75955,121341,187291,280644,409815,585020,818516,
 1124856,1521159,2027395,2666685,3465616,4454571,
 5668074,7145150,8929700,11070891,13623561,
 16648639,20213580,24392815,29268216,34929576]