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A131805 as a simple table

na(n)
00
1-1
21
30
44
53
69
78
816
915
1025
1124
1236
1335
1449
1548
1664
1763
1881
1980
20100
2199
22121
23120
24144
25143
26169
27168
28196
29195
30225
31224
32256
33255
34289
35288
36324
37323
38361
39360
40400
41399
42441
43440
44484
45483
46529
47528
48576
49575
50625
51624
52676
53675
54729
55728
56784
57783
58841

[0,-1,1,0,4,3,9,8,16,15,25,24,36,35,49,48,64,63,
 81,80,100,99,121,120,144,143,169,168,196,195,225,
 224,256,255,289,288,324,323,361,360,400,399,441,
 440,484,483,529,528,576,575,625,624,676,675,729,
 728,784,783,841]