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A247728 as a simple table

na(n)
18
290
3456
41592
54344
610098
720816
839264
969000
10114650
11181848
12277560
13409976
14588882
15825504
161132928
171525896
182021274
192637800
203396600
214320888
225436530
236771696
248357472
2510227464
2612418458
2714969976
2817924984
2921329400
3025232850

[8,90,456,1592,4344,10098,20816,39264,69000,
 114650,181848,277560,409976,588882,825504,1132928,
 1525896,2021274,2637800,3396600,4320888,5436530,
 6771696,8357472,10227464,12418458,14969976,
 17924984,21329400,25232850]