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A267681 as a simple table

na(n)
01
10
221
399
4471
51935
68031
732319
8130431
9522495
102094591
118381439
1233544191
13134189055
14536829951
152147368959
168589770751
1734359279615
18137438298111
19549753978879
202199020634111
218796085682175
2235184361603071
23140737458995199
24562949911478271

[1,0,21,99,471,1935,8031,32319,130431,522495,
 2094591,8381439,33544191,134189055,536829951,
 2147368959,8589770751,34359279615,137438298111,
 549753978879,2199020634111,8796085682175,
 35184361603071,140737458995199,562949911478271]