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A027840 as a simple table

n a(n)
1 1
2 15
3 220
4 5275
5 151086
6 6605004
7 362069912
8 26370058035
9 2384037107365
10 264380945199210
11 35133143655934644
12 5515729438742221708
13 1009373492449379367974
14 212997911074525038601560
15 51337590023913924398371080
16 14016616814674335739387516003 

[1,15,220,5275,151086,6605004,362069912,
 26370058035,2384037107365,264380945199210,
 35133143655934644,5515729438742221708,
 1009373492449379367974,212997911074525038601560,
 51337590023913924398371080,
 14016616814674335739387516003]

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Last modified May 31 23:52 EDT 2024. Contains 373008 sequences. (Running on oeis4.)