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A309538 as a simple table

na(n)
00
11
23
37
417
540
693
7210
8469
91036
102268
114928
1210640
1322848
1448832
15103936
16220416
17465920
18982016
192064384
204329472
219060352
2218923520
2339452672
2482116609
25170655746
26354156549
27734003212
281519386652
293141533760
306488588432
3113388218688
3227598521024

[0,1,3,7,17,40,93,210,469,1036,2268,4928,10640,
 22848,48832,103936,220416,465920,982016,2064384,
 4329472,9060352,18923520,39452672,82116609,
 170655746,354156549,734003212,1519386652,
 3141533760,6488588432,13388218688,27598521024]