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A081300 as a simple table

na(n)
01
15
255
3481
410501
5117181
63879331
752751105
82351234953
937766866501
102120129149711
1139311679607201
122663716583547085
1356019878838007085
144448878347069812251
15104660471059169187841
169534251497305019644433

[1,5,55,481,10501,117181,3879331,52751105,
 2351234953,37766866501,2120129149711,
 39311679607201,2663716583547085,56019878838007085,
 4448878347069812251,104660471059169187841,
 9534251497305019644433]