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A025756 as a simple table

n a(n)
0 1
1 1
2 4
3 22
4 139
5 949
6 6808
7 50548
8 384916
9 2988418
10 23559826
11 188061592
12 1516680130
13 12337999870
14 101111413540
15 833914857316
16 6916004156083
17 57638242134229
18 482444724374734
19 4053815358183454
20 34181335453533439

[1,1,4,22,139,949,6808,50548,384916,2988418,
 23559826,188061592,1516680130,12337999870,
 101111413540,833914857316,6916004156083,
 57638242134229,482444724374734,4053815358183454,
 34181335453533439]

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)