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A305050 as a simple table

na(n)
01
12
28
320
456
5128
6316
7684
81532
93192
106704
1113436
1226984
1352352
14101316
15191320
16359334
17662292
181213360
192189380
203925432
216951592
2212231332
2321298452
2436856840
2563211164
26107765896
27182295468
28306625208
29512190992
30851011960
311405199028
322308629300
333771593392

[1,2,8,20,56,128,316,684,1532,3192,6704,13436,
 26984,52352,101316,191320,359334,662292,1213360,
 2189380,3925432,6951592,12231332,21298452,
 36856840,63211164,107765896,182295468,306625208,
 512190992,851011960,1405199028,2308629300,
 3771593392]