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A253811 as a simple table

n a(n)
0 3
1 19
2 111
3 647
4 3771
5 21979
6 128103
7 746639
8 4351731
9 25363747
10 147830751
11 861620759
12 5021893803
13 29269742059
14 170596558551
15 994309609247
16 5795261096931
17 33777256972339
18 196868280737103
19 1147432427450279
20 6687726283964571
21 38978925276337147

[3,19,111,647,3771,21979,128103,746639,4351731,
 25363747,147830751,861620759,5021893803,
 29269742059,170596558551,994309609247,
 5795261096931,33777256972339,196868280737103,
 1147432427450279,6687726283964571,
 38978925276337147]

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Last modified July 25 16:39 EDT 2021. Contains 346291 sequences. (Running on oeis4.)