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A366115 as a simple table

na(n)
01
14
221
3125
4801
55390
637558
7268656
81961355
914555266
10109472688
11832625469
126393072182
1349488174700
14385795571040
153026190911853
1623867383581009
17189156323865632
181505649098866535
1912031665674394905
2096486323017581420
21776255276240140980

[1,4,21,125,801,5390,37558,268656,1961355,
 14555266,109472688,832625469,6393072182,
 49488174700,385795571040,3026190911853,
 23867383581009,189156323865632,1505649098866535,
 12031665674394905,96486323017581420,
 776255276240140980]