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A086346 as a simple table

n a(n)
0 1
1 3
2 18
3 80
4 400
5 1904
6 9248
7 44544
8 215296
9 1039104
10 5018112
11 24227840
12 116985856
13 564850688
14 2727354368
15 13168803840
16 63584665600
17 307013812224
18 1482394042368
19 7157631156224
20 34560101318656
21 166870928850944
22 805724122775552
23 3890380202311680
24 18784417308737536
25 90699190027419648

[1,3,18,80,400,1904,9248,44544,215296,1039104,
 5018112,24227840,116985856,564850688,2727354368,
 13168803840,63584665600,307013812224,
 1482394042368,7157631156224,34560101318656,
 166870928850944,805724122775552,3890380202311680,
 18784417308737536,90699190027419648]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)