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A072197 as a simple table

n a(n)
0 3
1 13
2 53
3 213
4 853
5 3413
6 13653
7 54613
8 218453
9 873813
10 3495253
11 13981013
12 55924053
13 223696213
14 894784853
15 3579139413
16 14316557653
17 57266230613
18 229064922453
19 916259689813
20 3665038759253
21 14660155037013
22 58640620148053
23 234562480592213
24 938249922368853

[3,13,53,213,853,3413,13653,54613,218453,873813,
 3495253,13981013,55924053,223696213,894784853,
 3579139413,14316557653,57266230613,229064922453,
 916259689813,3665038759253,14660155037013,
 58640620148053,234562480592213,938249922368853]

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Last modified August 6 00:46 EDT 2021. Contains 346493 sequences. (Running on oeis4.)