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A026740 as a simple table

na(n)
00
10
24
356
4560
54960
641664
7341376
82763520
922238720
10178433024
111429559296
1211444858880
1391592417280
14732873539584
155863525154816
1646910348656640
17375291379056640
183002365391929344
1924019060573863936
20192153034345676800
211537226473786572800

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