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A145820 as a simple table

na(n)
18
29
316
425
540
689
7144
8233
9520
10841
111360
123033
134904
147929
1517680
1628585
1746216
18103049
19166608
20269369
21600616
22971065
231570000
243500649
255659784
269150633
2720403280
2832987641
2953333800
30118919033
31192266064
32310852169
33693110920

[8,9,16,25,40,89,144,233,520,841,1360,3033,4904,
 7929,17680,28585,46216,103049,166608,269369,
 600616,971065,1570000,3500649,5659784,9150633,
 20403280,32987641,53333800,118919033,192266064,
 310852169,693110920]