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A147685 as a simple table

na(n)
00
11
21
35
44
513
69
725
816
941
1025
1161
1236
1385
1449
15113
1664
17145
1881
19181
20100
21221
22121
23265
24144
25313
26169
27365
28196
29421
30225
31481
32256
33545
34289
35613
36324
37685
38361
39761
40400
41841
42441
43925
44484
451013
46529
471105
48576
491201
50625
511301
52676
531405
54729
551513

[0,1,1,5,4,13,9,25,16,41,25,61,36,85,49,113,64,
 145,81,181,100,221,121,265,144,313,169,365,196,
 421,225,481,256,545,289,613,324,685,361,761,400,
 841,441,925,484,1013,529,1105,576,1201,625,1301,
 676,1405,729,1513]