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A317113 as a simple table

n a(n)
1 4
2 30
3 142
4 698
5 3398
6 16686
7 81809
8 401415
9 1969107
10 9660093
11 47389711
12 232481946
13 1140496397
14 5594981980
15 27447541559
16 134650576212
17 660561074466
18 3240542648641
19 15897268312271
20 77987907394984
21 382588604448738

[4,30,142,698,3398,16686,81809,401415,1969107,
 9660093,47389711,232481946,1140496397,5594981980,
 27447541559,134650576212,660561074466,
 3240542648641,15897268312271,77987907394984,
 382588604448738]

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Last modified October 20 16:07 EDT 2021. Contains 348111 sequences. (Running on oeis4.)