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A217144 as a simple table

n a(n)
0 1
1 0
2 4
3 21
4 204
5 2500
6 38709
7 730420
8 16409180
9 430786429
10 13019414196
11 447437830704
12 17306961847705
13 746907935199264
14 35695643204860420
15 1876878693983656605
16 107956500727342113004
17 6758630146906528885412
18 458470139353155531447869

[1,0,4,21,204,2500,38709,730420,16409180,
 430786429,13019414196,447437830704,17306961847705,
 746907935199264,35695643204860420,
 1876878693983656605,107956500727342113004,
 6758630146906528885412,458470139353155531447869]

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)