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A199318 as a simple table

n a(n)
0 4
1 19
2 109
3 649
4 3889
5 23329
6 139969
7 839809
8 5038849
9 30233089
10 181398529
11 1088391169
12 6530347009
13 39182082049
14 235092492289
15 1410554953729
16 8463329722369
17 50779978334209
18 304679870005249
19 1828079220031489
20 10968475320188929

[4,19,109,649,3889,23329,139969,839809,5038849,
 30233089,181398529,1088391169,6530347009,
 39182082049,235092492289,1410554953729,
 8463329722369,50779978334209,304679870005249,
 1828079220031489,10968475320188929]

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Last modified December 3 18:19 EST 2021. Contains 349467 sequences. (Running on oeis4.)