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A155857 as a simple table

na(n)
01
12
26
323
4107
5590
63786
727821
8230869
92137978
1021873854
11245151555
122987967551
1339358156310
14557259550034
158440866957273
16136211005966889
172333068710452146
1842276699542130166
19808068680469402095
2016248405328930779027
21342877404288485770718
227576652528705018522906

[1,2,6,23,107,590,3786,27821,230869,2137978,
 21873854,245151555,2987967551,39358156310,
 557259550034,8440866957273,136211005966889,
 2333068710452146,42276699542130166,
 808068680469402095,16248405328930779027,
 342877404288485770718,7576652528705018522906]