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A306057 as a simple table

n a(n)
1 16
2 64
3 189
4 608
5 3572
6 16833
7 67791
8 313348
9 1479005
10 6565230
11 29422003
12 134821503
13 611371817
14 2755886039
15 12498196528
16 56717052098
17 256697600693
18 1162416576283
19 5268737004991
20 23869099972053
21 108109669604193

[16,64,189,608,3572,16833,67791,313348,1479005,
 6565230,29422003,134821503,611371817,2755886039,
 12498196528,56717052098,256697600693,
 1162416576283,5268737004991,23869099972053,
 108109669604193]

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Last modified December 9 02:53 EST 2021. Contains 349625 sequences. (Running on oeis4.)