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A220816 as a simple table

n a(n)
1 3
2 6
3 18
4 75
5 333
6 1620
7 8208
8 43188
9 232947
10 1282824
11 7178598
12 40711158
13 233445483
14 1351255608
15 7884677052
16 46330220604
17 273905815095
18 1628113352418
19 9724235975136
20 58330497033576
21 351252593186211
22 2122598374680816
23 12867757823745036
24 78235685862460893

[3,6,18,75,333,1620,8208,43188,232947,1282824,
 7178598,40711158,233445483,1351255608,7884677052,
 46330220604,273905815095,1628113352418,
 9724235975136,58330497033576,351252593186211,
 2122598374680816,12867757823745036,
 78235685862460893]

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Last modified September 24 07:28 EDT 2020. Contains 337317 sequences. (Running on oeis4.)