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A038723 as a simple table

n a(n)
0 1
1 4
2 23
3 134
4 781
5 4552
6 26531
7 154634
8 901273
9 5253004
10 30616751
11 178447502
12 1040068261
13 6061962064
14 35331704123
15 205928262674
16 1200237871921
17 6995498968852
18 40772755941191
19 237641036678294
20 1385073464128573

[1,4,23,134,781,4552,26531,154634,901273,5253004,
 30616751,178447502,1040068261,6061962064,
 35331704123,205928262674,1200237871921,
 6995498968852,40772755941191,237641036678294,
 1385073464128573]

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Last modified March 3 13:38 EST 2021. Contains 341762 sequences. (Running on oeis4.)