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A179274 as a simple table

na(n)
15
26
37
410
519
648
7175
8864
95837
1051800
11584259
128124352
13135854841
142676859186
1561120545021
161594967614576
1747019134572933

[5,6,7,10,19,48,175,864,5837,51800,584259,8124352,
 135854841,2676859186,61120545021,1594967614576,
 47019134572933]