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A296789 as a simple table

na(n)
01
12
220
3504
424464
51959840
6234852672
739370660224
88799246209280
92528787321598464
10908585701684024320
11399070678264750356480
12210373049449102957645824
13131083661069772517440921600
1495304505860052894815543705600
1579961055068441273887848131297280

[1,2,20,504,24464,1959840,234852672,39370660224,
 8799246209280,2528787321598464,908585701684024320,
 399070678264750356480,210373049449102957645824,
 131083661069772517440921600,
 95304505860052894815543705600,
 79961055068441273887848131297280]