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A126147 as a simple table

na(n)
10
20
31
44
519
6177
71766
826868
9421725
107692857
11208699781
125420553787
13180993613044
147075587523888
15278356624078085
1611601694011103611
17552358618257458385
1831520661477937912115
191750572856110551805720

[0,0,1,4,19,177,1766,26868,421725,7692857,
 208699781,5420553787,180993613044,7075587523888,
 278356624078085,11601694011103611,
 552358618257458385,31520661477937912115,
 1750572856110551805720]