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A097681 as a simple table

na(n)
01
16
236
3216
41296
57776
647376
7314496
82612736
928740096
10368395776
114796983296
1260300205056
13750367328256
1410151357239296
15164475953381376
163110937349718016
1761410199093641216
181174438559356747776

[1,6,36,216,1296,7776,47376,314496,2612736,
 28740096,368395776,4796983296,60300205056,
 750367328256,10151357239296,164475953381376,
 3110937349718016,61410199093641216,
 1174438559356747776]