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A084084 as a simple table

n a(n)
0 1
1 3
2 9
3 28
4 86
5 265
6 816
7 2513
8 7739
9 23833
10 73396
11 226030
12 696081
13 2143648
14 6601569
15 20330163
16 62608681
17 192809420
18 593775046
19 1828587033
20 5631308624
21 17342153393
22 53406819691
23 164471408185
24 506505428836
25 1559831901918

[1,3,9,28,86,265,816,2513,7739,23833,73396,226030,
 696081,2143648,6601569,20330163,62608681,
 192809420,593775046,1828587033,5631308624,
 17342153393,53406819691,164471408185,506505428836,
 1559831901918]

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Last modified September 20 03:49 EDT 2019. Contains 327210 sequences. (Running on oeis4.)