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A106260 as a simple table

na(n)
01
18
2104
31472
421856
5333568
65183744
781590272
81296426496
920750839808
10334081306624
115404163080192
1287763693060096
131430025994108928
1423367175920287744
15382767375745810432
166283401962864377856

[1,8,104,1472,21856,333568,5183744,81590272,
 1296426496,20750839808,334081306624,5404163080192,
 87763693060096,1430025994108928,23367175920287744,
 382767375745810432,6283401962864377856]