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A026622 as a simple table

na(n)
01
12
25
312
426
554
6110
7222
8446
9894
101790
113582
127166
1314334
1428670
1557342
16114686
17229374
18458750
19917502
201835006
213670014
227340030
2314680062
2429360126
2558720254
26117440510
27234881022
28469762046
29939524094
301879048190
313758096382
327516192766

[1,2,5,12,26,54,110,222,446,894,1790,3582,7166,
 14334,28670,57342,114686,229374,458750,917502,
 1835006,3670014,7340030,14680062,29360126,
 58720254,117440510,234881022,469762046,939524094,
 1879048190,3758096382,7516192766]