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A212874 as a simple table

na(n)
10
20
32
412
540
6122
7319
8722
91503
102872
115159
129087
1315030
1424441
1538349
1658701
1786682
18127439
19180934
20255292
21354781
22484863
23649910
24870659
251146208
261495708
271935479
282485685
293146345
303979502
314964688
326177498
337637218
349375304

[0,0,2,12,40,122,319,722,1503,2872,5159,9087,
 15030,24441,38349,58701,86682,127439,180934,
 255292,354781,484863,649910,870659,1146208,
 1495708,1935479,2485685,3146345,3979502,4964688,
 6177498,7637218,9375304]