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A097552 as a simple table

na(n)
01
15
220
367
4209
5630
61873
75540
816357
948265
10142387
11420027
121239006
133654820
1410780958
1531801551
1693807834
17276713194
18816245143
192407749755
207102350204
2120950424039
2261799299470
23182294802589
24537730934397

[1,5,20,67,209,630,1873,5540,16357,48265,142387,
 420027,1239006,3654820,10780958,31801551,93807834,
 276713194,816245143,2407749755,7102350204,
 20950424039,61799299470,182294802589,537730934397]