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A297715 as a simple table

n a(n)
1 4
2 34
3 145
4 747
5 4090
6 21116
7 110551
8 582755
9 3055652
10 16036278
11 84225551
12 442157803
13 2321279598
14 12187515422
15 63986012963
16 335934438957
17 1763713210610
18 9259764998068
19 48615161059469
20 255237152397199
21 1340034403055100

[4,34,145,747,4090,21116,110551,582755,3055652,
 16036278,84225551,442157803,2321279598,
 12187515422,63986012963,335934438957,
 1763713210610,9259764998068,48615161059469,
 255237152397199,1340034403055100]

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Last modified December 2 19:48 EST 2021. Contains 349445 sequences. (Running on oeis4.)