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A278689 as a simple table

n a(n)
0 0
1 1
2 4
3 25
4 170
5 1204
6 8736
7 64416
8 480480
9 3615040
10 27382784
11 208539136
12 1595216896
13 12247746560
14 94330470400
15 728474664960
16 5638832087040
17 43737154928640
18 339856038297600
19 2645063771750400
20 20615846154731520
21 160889637246074880
22 1257082279931412480

[0,1,4,25,170,1204,8736,64416,480480,3615040,
 27382784,208539136,1595216896,12247746560,
 94330470400,728474664960,5638832087040,
 43737154928640,339856038297600,2645063771750400,
 20615846154731520,160889637246074880,
 1257082279931412480]

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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)