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A304264 as a simple table

na(n)
11
21
36
421
5146
61246
713767
8252509
95755625
10177353720
118354131403
12523250794396
1344173651472383
145428616779817049
15920678621074132173
16212277158481925445968
1769198443091508695982216

[1,1,6,21,146,1246,13767,252509,5755625,177353720,
 8354131403,523250794396,44173651472383,
 5428616779817049,920678621074132173,
 212277158481925445968,69198443091508695982216]