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A278282 as a simple table

n a(n)
1 0
2 5
3 25
4 122
5 661
6 3723
7 20736
8 115446
9 643201
10 3583987
11 19968771
12 111259772
13 619906272
14 3453935575
15 19244300244
16 107223525884
17 597417624393
18 3328633543713
19 18546157153693
20 103333677917171
21 575744553924121

[0,5,25,122,661,3723,20736,115446,643201,3583987,
 19968771,111259772,619906272,3453935575,
 19244300244,107223525884,597417624393,
 3328633543713,18546157153693,103333677917171,
 575744553924121]

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Last modified December 7 23:30 EST 2023. Contains 367662 sequences. (Running on oeis4.)