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A147855 as a simple table

n a(n)
0 1
1 3
2 22
3 174
4 1444
5 12323
6 107104
7 942952
8 8381596
9 75053100
10 676017962
11 6118171326
12 55591175956
13 506805088026
14 4633571685968
15 42468065811884
16 390071875757852
17 3589637747968964
18 33089300640166360
19 305476314574338648
20 2823932709938708824
21 26137341654281261347

[1,3,22,174,1444,12323,107104,942952,8381596,
 75053100,676017962,6118171326,55591175956,
 506805088026,4633571685968,42468065811884,
 390071875757852,3589637747968964,
 33089300640166360,305476314574338648,
 2823932709938708824,26137341654281261347]

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Last modified January 26 23:05 EST 2020. Contains 331289 sequences. (Running on oeis4.)