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A281420 as a simple table

na(n)
01
13
26
315
426
563
6106
7255
8426
91023
101706
114095
126826
1316383
1427310
1565531
16109220
17262142
18437163
191047676
201747642
214194031
226990224
2316776824
2427961740
2567108434
26111913983
27268205286
28447392735
291073676074
301789520383
314294901466
327158229423

[1,3,6,15,26,63,106,255,426,1023,1706,4095,6826,
 16383,27310,65531,109220,262142,437163,1047676,
 1747642,4194031,6990224,16776824,27961740,
 67108434,111913983,268205286,447392735,1073676074,
 1789520383,4294901466,7158229423]