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A091643 as a simple table

n a(n)
1 4
2 19
3 108
4 687
5 4766
6 35139
7 267486
8 2083814
9 16531372
10 133059504
11 1082995490
12 8896945667
13 73651718719
14 613664827254

[4,19,108,687,4766,35139,267486,2083814,16531372,
 133059504,1082995490,8896945667,73651718719,
 613664827254]

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Last modified November 18 17:45 EST 2019. Contains 329287 sequences. (Running on oeis4.)