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A015677 as a simple table

na(n)
01
121
2399
36783
4102249
51370565
616991415
7216411615
83146775345
949819225365
10767467173375
1111808542505375
12208290421179225
134084751136190725
1476593243172220775
151426967042034909375

[1,21,399,6783,102249,1370565,16991415,216411615,
 3146775345,49819225365,767467173375,
 11808542505375,208290421179225,4084751136190725,
 76593243172220775,1426967042034909375]