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A221421 as a simple table

n a(n)
1 0
2 8
3 0
4 226
5 0
6 6798
7 0
8 198823
9 0
10 5789134
11 0
12 168353683
13 0
14 4894400220
15 0
16 142279944512
17 0
18 4135993312056
19 0
20 120230312311224
21 0
22 3495003621811704
23 0
24 101597065323229956
25 0
26 2953348289319127152
27 0
28 85851554285154067136
29 0

[0,8,0,226,0,6798,0,198823,0,5789134,0,168353683,
 0,4894400220,0,142279944512,0,4135993312056,0,
 120230312311224,0,3495003621811704,0,
 101597065323229956,0,2953348289319127152,0,
 85851554285154067136,0]

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Last modified July 15 18:49 EDT 2024. Contains 374333 sequences. (Running on oeis4.)