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A347750 as a simple table

na(n)
00
15
217
357
4133
5297
6525
7925
81477
92289
103277
114701
126437
138805
1411541
1514917
1618869
1723893
1829509
1936473
2044349
2153545
2263605
2375629
2488901
25104325
26120981
27139913
28160581
29184409
30209885
31238989
32270525
33305413
34342413
35383301
36426949
37475757
38527205
39583261
40642821
41708717
42777829

[0,5,17,57,133,297,525,925,1477,2289,3277,4701,
 6437,8805,11541,14917,18869,23893,29509,36473,
 44349,53545,63605,75629,88901,104325,120981,
 139913,160581,184409,209885,238989,270525,305413,
 342413,383301,426949,475757,527205,583261,642821,
 708717,777829]