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A017945 as a simple table

n a(n)
0 1
1 4
2 13
3 47
4 169
5 610
6 2197
7 7922
8 28561
9 102979
10 371293
11 1338716
12 4826809
13 17403308
14 62748517
15 226242996
16 815730721
17 2941158942
18 10604499373
19 38235066240
20 137858491849
21 497055861120
22 1792160394037

[1,4,13,47,169,610,2197,7922,28561,102979,371293,
 1338716,4826809,17403308,62748517,226242996,
 815730721,2941158942,10604499373,38235066240,
 137858491849,497055861120,1792160394037]

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Last modified May 14 11:10 EDT 2024. Contains 372532 sequences. (Running on oeis4.)