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A006818 as a simple table

n a(n)
0 1
1 6
2 30
3 150
4 738
5 3570
6 17118
7 81498
8 385710
9 1817046
10 8528478
11 39903462
12 186198642
13 866861394
14 4027766490
15 18681900270
16 86518735722
17 400136695074
18 1848320799438
19 8528448008214

[1,6,30,150,738,3570,17118,81498,385710,1817046,
 8528478,39903462,186198642,866861394,4027766490,
 18681900270,86518735722,400136695074,
 1848320799438,8528448008214]

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Last modified April 20 07:43 EDT 2024. Contains 371799 sequences. (Running on oeis4.)