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A121607 as a simple table

na(n)
16
290
3810
45508
531590
6161838
7765450
83411720
914526054
1059639490
11237731274
12924707340
133523453830
1413191428502
1548642794730
16177008116752
17636661003590
182266409860650
197994034370026
2027964010896020
2197092998430246

[6,90,810,5508,31590,161838,765450,3411720,
 14526054,59639490,237731274,924707340,3523453830,
 13191428502,48642794730,177008116752,636661003590,
 2266409860650,7994034370026,27964010896020,
 97092998430246]