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A106259 as a simple table

na(n)
01
16
260
3648
47344
585536
61014336
712182400
8147702528
91803907584
1022159733760
11273508669440
123389106769920
1342134712606720
14525323149885440
156565657319866368
1682235651779657728
171031956779869798400

[1,6,60,648,7344,85536,1014336,12182400,147702528,
 1803907584,22159733760,273508669440,3389106769920,
 42134712606720,525323149885440,6565657319866368,
 82235651779657728,1031956779869798400]