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A266520 as a simple table

n a(n)
1 4
2 65
3 3252
4 319422
5 51147492
6 12057585792
7 3922351554132
8 1682965461982320
9 921043932965502660
10 626381920753520549760
11 518386843395242486312436
12 513135100084662037473481728
13 598802670522558079363471420836
14 813678320999818358850938259419136
15 1273853548265201707125719549854268820
16 2276462439285471707026207820594795624448 

[4,65,3252,319422,51147492,12057585792,
 3922351554132,1682965461982320,921043932965502660,
 626381920753520549760,518386843395242486312436,
 513135100084662037473481728,
 598802670522558079363471420836,
 813678320999818358850938259419136,
 1273853548265201707125719549854268820,
 2276462439285471707026207820594795624448]

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Last modified August 19 06:29 EDT 2024. Contains 375284 sequences. (Running on oeis4.)