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A221427 as a simple table

n a(n)
1 1
2 217
3 4390
4 194879
5 6688747
6 250167826
7 9077677881
8 333226472511
9 12173165267828
10 445650138090486
11 16298689612917528
12 596369615071847374
13 21816211474871696352
14 798162015570301300322
15 29199761336459862799952 

[1,217,4390,194879,6688747,250167826,9077677881,
 333226472511,12173165267828,445650138090486,
 16298689612917528,596369615071847374,
 21816211474871696352,798162015570301300322,
 29199761336459862799952]

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Last modified July 3 10:25 EDT 2022. Contains 355050 sequences. (Running on oeis4.)