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A226989 as a simple table

na(n)
115
2120
3608
42820
511325
640431
7130479
8385529
91054857
102699060
116512038
1214918723
1332643565
1468558024
15138781999
16271754453
17516328629
18954420655
191720389300
203030202067
215224614220
228832133194
2314659559110
2423920501241

[15,120,608,2820,11325,40431,130479,385529,
 1054857,2699060,6512038,14918723,32643565,
 68558024,138781999,271754453,516328629,954420655,
 1720389300,3030202067,5224614220,8832133194,
 14659559110,23920501241]