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A028498 as a simple table

n a(n)
0 1
1 4
2 24
3 186
4 1770
5 19980
6 260820
7 3863160
8 63980280
9 1171195200
10 23476068000
11 511296786000
12 12021166357200
13 303414507396000
14 8182057223340000
15 234753130435824000
16 7139815170664176000
17 229442416696164672000
18 7767967204994540544000
19 276345182709766890720000

[1,4,24,186,1770,19980,260820,3863160,63980280,
 1171195200,23476068000,511296786000,
 12021166357200,303414507396000,8182057223340000,
 234753130435824000,7139815170664176000,
 229442416696164672000,7767967204994540544000,
 276345182709766890720000]

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Last modified June 29 06:14 EDT 2024. Contains 373826 sequences. (Running on oeis4.)