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A222646 as a simple table

na(n)
15
238
3157
43411
525724
6640355
75969486
8171452513
91679184332
1049651101137
11492598252164
1214686568899907
13146101017534391
144371548520227608
1543539382164274640
161306171266098680162
1713019733745716644843

[5,38,157,3411,25724,640355,5969486,171452513,
 1679184332,49651101137,492598252164,
 14686568899907,146101017534391,4371548520227608,
 43539382164274640,1306171266098680162,
 13019733745716644843]