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A018004 as a simple table

na(n)
01
12
25
310
422
546
6100
7215
8464
91000
102154
114642
1210000
1321544
1446416
15100000
16215443
17464159
181000000
192154435
204641589
2110000000
2221544347
2346415888
24100000000
25215443469
26464158883
271000000000
282154434690
294641588834
3010000000000
3121544346900

[1,2,5,10,22,46,100,215,464,1000,2154,4642,10000,
 21544,46416,100000,215443,464159,1000000,2154435,
 4641589,10000000,21544347,46415888,100000000,
 215443469,464158883,1000000000,2154434690,
 4641588834,10000000000,21544346900]