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A215047 as a simple table

n a(n)
1 3
2 18
3 111
4 840
5 6655
6 54109
7 456361
8 3954180
9 34900212
10 312357933
11 2826683629
12 25814570671
13 237542444179
14 2199894223891

[3,18,111,840,6655,54109,456361,3954180,34900212,
 312357933,2826683629,25814570671,237542444179,
 2199894223891]

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Last modified March 29 08:45 EDT 2024. Contains 371267 sequences. (Running on oeis4.)