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A105628 as a simple table

n a(n)
0 1
1 4
2 25
3 208
4 2152
5 26524
6 378700
7 6142948
8 111593932
9 2244992404
10 49561796380
11 1191625266388
12 31001841211852
13 867899276874964
14 26017959787456060
15 831650920910208628
16 28237504357447540972
17 1014987937635390612724

[1,4,25,208,2152,26524,378700,6142948,111593932,
 2244992404,49561796380,1191625266388,
 31001841211852,867899276874964,26017959787456060,
 831650920910208628,28237504357447540972,
 1014987937635390612724]

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Last modified January 25 21:23 EST 2021. Contains 340427 sequences. (Running on oeis4.)