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A163131 as a simple table

na(n)
13
275
3969
48964
566975
6429096
72442372
812640320
960454713
10270391857
111141260315
124578160257
1317554638039
1464642406670
15229486544439
16788018124312
172624648438025
188499852952224
1926820711864657
2082613109082410

[3,75,969,8964,66975,429096,2442372,12640320,
 60454713,270391857,1141260315,4578160257,
 17554638039,64642406670,229486544439,788018124312,
 2624648438025,8499852952224,26820711864657,
 82613109082410]