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A081907 as a simple table

na(n)
01
18
261
3450
43240
522896
6159408
71096416
87464960
950388480
10337602816
112247326208
1214874679296
1397955205120
14642150789120
154192482779136
1627270729105408
17176789554200576
181142549512519680
197363096858460160

[1,8,61,450,3240,22896,159408,1096416,7464960,
 50388480,337602816,2247326208,14874679296,
 97955205120,642150789120,4192482779136,
 27270729105408,176789554200576,1142549512519680,
 7363096858460160]