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A027311 as a simple table

n a(n)
2 4
3 43
4 396
5 3465
6 29730
7 253008
8 2145968
9 18184052
10 154119660
11 1307389666
12 11104039000
13 94441581936
14 804428517984
15 6862216318250
16 58625961078432
17 501592568400544
18 4297633705136632
19 36872583343109643
20 316774930400206020

[4,43,396,3465,29730,253008,2145968,18184052,
 154119660,1307389666,11104039000,94441581936,
 804428517984,6862216318250,58625961078432,
 501592568400544,4297633705136632,
 36872583343109643,316774930400206020]

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Last modified April 25 13:34 EDT 2024. Contains 371971 sequences. (Running on oeis4.)