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A141074 as a simple table

n a(n)
0 0
1 0
2 2
3 18
4 402
5 7850
6 162290
7 3667650
8 91171010
9 2486784402
10 74062575402
11 2395420006034
12 83695120256594
13 3143661612445146
14 126375169532421602
15 5415486851106043650
16 246486713303685957378
17 11877172892329028459042

[0,0,2,18,402,7850,162290,3667650,91171010,
 2486784402,74062575402,2395420006034,
 83695120256594,3143661612445146,
 126375169532421602,5415486851106043650,
 246486713303685957378,11877172892329028459042]

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Last modified October 1 08:04 EDT 2022. Contains 357135 sequences. (Running on oeis4.)