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A093761 as a simple table

na(n)
21
345
4315
5606375
67640325
718573630075
8655383804075
938264331330225
10916111865931136875
11100955527625611283625
122139180694732706625
1326851955023354986149625
141684402483265040315792015

[1,45,315,606375,7640325,18573630075,655383804075,
 38264331330225,916111865931136875,
 100955527625611283625,2139180694732706625,
 26851955023354986149625,1684402483265040315792015]