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A222856 as a simple table

n a(n)
1 3
2 6
3 18
4 41
5 123
6 310
7 957
8 2530
9 7848
10 21618
11 67131
12 188835
13 585276
14 1670602
15 5161503
16 14880389
17 45808419
18 133004125
19 408229851
20 1191329175
21 3646802121
22 10684589006
23 32632896159
24 95903053435
25 292350907470
26 861289976308

[3,6,18,41,123,310,957,2530,7848,21618,67131,
 188835,585276,1670602,5161503,14880389,45808419,
 133004125,408229851,1191329175,3646802121,
 10684589006,32632896159,95903053435,292350907470,
 861289976308]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)