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A006750 as a simple table

na(n)
28
388
42992
523408
6354200
72641320
8156641760
91159149024
1017161845272
11127234370120
123780912959824
1328153740304144
14420295123111864
153144786170643656
16377374340477238720
172836750530124023744

[8,88,2992,23408,354200,2641320,156641760,
 1159149024,17161845272,127234370120,3780912959824,
 28153740304144,420295123111864,3144786170643656,
 377374340477238720,2836750530124023744]