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A181479 as a simple table

na(n)
01
17
249
3231
41029
53843
613573
743219
8131131
9370909
101007083
112596573
126466159
1315465961
1435906959
1580682553
16176682268
17376497604
18784435036
191596836164
203186750028
216232957588
2211978020684
2322615355476
2442031123204
2576900938268

[1,7,49,231,1029,3843,13573,43219,131131,370909,
 1007083,2596573,6466159,15465961,35906959,
 80682553,176682268,376497604,784435036,1596836164,
 3186750028,6232957588,11978020684,22615355476,
 42031123204,76900938268]