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A020871 as a simple table

n a(n)
0 0
1 3
2 16
3 81
4 392
5 1815
6 8112
7 35301
8 150544
9 632043
10 2620880
11 10759353
12 43804824
13 177105279
14 711809392
15 2846259405
16 11330543648
17 44929049811
18 177540878736
19 699402223137
20 2747583822760
21 10766828545767
22 42095796462896
23 164244726238389
24 639620518118448

[0,3,16,81,392,1815,8112,35301,150544,632043,
 2620880,10759353,43804824,177105279,711809392,
 2846259405,11330543648,44929049811,177540878736,
 699402223137,2747583822760,10766828545767,
 42095796462896,164244726238389,639620518118448]

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Last modified March 28 05:02 EDT 2024. Contains 371235 sequences. (Running on oeis4.)