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A231539 as a simple table

n a(n)
1 4
2 20
3 116
4 589
5 3001
6 15644
7 81179
8 420243
9 2177937
10 11287977
11 58494710
12 303132340
13 1570918959
14 8140881877
15 42188034539
16 218628945511
17 1132989453013
18 5871432030067
19 30427217632524
20 157681390442587
21 817144077007238

[4,20,116,589,3001,15644,81179,420243,2177937,
 11287977,58494710,303132340,1570918959,8140881877,
 42188034539,218628945511,1132989453013,
 5871432030067,30427217632524,157681390442587,
 817144077007238]

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Last modified August 13 22:39 EDT 2022. Contains 356109 sequences. (Running on oeis4.)