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A015677 as a simple table

n a(n)
0 1
1 21
2 399
3 6783
4 102249
5 1370565
6 16991415
7 216411615
8 3146775345
9 49819225365
10 767467173375
11 11808542505375
12 208290421179225
13 4084751136190725
14 76593243172220775
15 1426967042034909375

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

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Last modified December 6 06:14 EST 2021. Contains 349563 sequences. (Running on oeis4.)