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A254681 as a simple table

na(n)
11
221
3176
4936
53750
612342
735112
889232
9207207
10446875
11906048
121743248
133206268
145670588
159690000
1616062144
1725912029
1840797009
1962837104
2094875000
21140670530
22205134930
23294610680
24417203280
25583171875
26805386231

[1,21,176,936,3750,12342,35112,89232,207207,
 446875,906048,1743248,3206268,5670588,9690000,
 16062144,25912029,40797009,62837104,94875000,
 140670530,205134930,294610680,417203280,583171875,
 805386231]