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A180399 as a simple table

n a(n)
0 0
1 1
2 4
3 21
4 138
5 999
6 7683
7 61542
8 507663
9 4281849
10 36748998
11 319845591
12 2816007714
13 25032803841
14 224355173193
15 2024955168606
16 18388543939947
17 167882583075453
18 1540000362501702
19 14186252492098011
20 131176523761136568
21 1217094112710349731
22 11327464549934673309

[0,1,4,21,138,999,7683,61542,507663,4281849,
 36748998,319845591,2816007714,25032803841,
 224355173193,2024955168606,18388543939947,
 167882583075453,1540000362501702,
 14186252492098011,131176523761136568,
 1217094112710349731,11327464549934673309]

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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)