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A123615 as a simple table

na(n)
01
16
263
3392
41764
56352
619404
752272
8127413
9286286
10601203
111192464
122252432
134078368
147116336
1512018704
1619718181
1731521798
1849228487
1975274584
20112911880
21166423400
22241382700
23344962800
24486301725
25676932006
26931282191
271267259168

[1,6,63,392,1764,6352,19404,52272,127413,286286,
 601203,1192464,2252432,4078368,7116336,12018704,
 19718181,31521798,49228487,75274584,112911880,
 166423400,241382700,344962800,486301725,676932006,
 931282191,1267259168]