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A047144 as a simple table

na(n)
21
34
413
542
6148
7540
81945
96994
1025784
1196564
12361560
131353608
145113044
1519462184
1674227737
17283335006
181085696746
194176869836
2016100775648
2162132631186
22240258482330
23931152718588
243614359486290
2514044139747816

[1,4,13,42,148,540,1945,6994,25784,96564,361560,
 1353608,5113044,19462184,74227737,283335006,
 1085696746,4176869836,16100775648,62132631186,
 240258482330,931152718588,3614359486290,
 14044139747816]