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A026740 as a simple table

n a(n)
0 0
1 0
2 4
3 56
4 560
5 4960
6 41664
7 341376
8 2763520
9 22238720
10 178433024
11 1429559296
12 11444858880
13 91592417280
14 732873539584
15 5863525154816
16 46910348656640
17 375291379056640
18 3002365391929344
19 24019060573863936
20 192153034345676800
21 1537226473786572800

[0,0,4,56,560,4960,41664,341376,2763520,22238720,
 178433024,1429559296,11444858880,91592417280,
 732873539584,5863525154816,46910348656640,
 375291379056640,3002365391929344,
 24019060573863936,192153034345676800,
 1537226473786572800]

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Last modified April 25 07:07 EDT 2024. Contains 371964 sequences. (Running on oeis4.)