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A263786 as a simple table

na(n)
10
20
30
41
55
666
7392
84859
926994
10232208
111161998
128246455
1341787717
14274395962
151457963344
169504972075
1753127306403
18343749866061
191960779086021
2012451275397390
2171531553827855
22445155989823862
232568693912325240

[0,0,0,1,5,66,392,4859,26994,232208,1161998,
 8246455,41787717,274395962,1457963344,9504972075,
 53127306403,343749866061,1960779086021,
 12451275397390,71531553827855,445155989823862,
 2568693912325240]