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A174489 as a simple table

n a(n)
0 1
1 4
2 56
3 1672
4 85904
5 6741544
6 749040472
7 111786940612
8 21558649749088
9 5215883627856592
10 1546429233541304456
11 551278120123210461436
12 232603216443181020788944
13 114634034948809175011787176

[1,4,56,1672,85904,6741544,749040472,111786940612,
 21558649749088,5215883627856592,
 1546429233541304456,551278120123210461436,
 232603216443181020788944,
 114634034948809175011787176]

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Last modified January 26 13:42 EST 2022. Contains 350598 sequences. (Running on oeis4.)