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A084847 as a simple table

n a(n)
0 1
1 4
2 18
3 86
4 418
5 2022
6 9650
7 45334
8 209730
9 956870
10 4312402
11 19228662
12 84948962
13 372287398
14 1620178674
15 7008019670
16 30150864514
17 129107299206
18 550530654866
19 2338786731958
20 9902578218786
21 41802362561894
22 175984622563378

[1,4,18,86,418,2022,9650,45334,209730,956870,
 4312402,19228662,84948962,372287398,1620178674,
 7008019670,30150864514,129107299206,550530654866,
 2338786731958,9902578218786,41802362561894,
 175984622563378]

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Last modified May 28 17:37 EDT 2020. Contains 334684 sequences. (Running on oeis4.)