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A188959 as a simple table

na(n)
12
224
3720
424024
5570050
612702057
7298167456
87208117568
9173161739904
104127570837184
1198339773309856
122347000930925753
1356041331020681154
141337774984135116376
1531928671287098350544
16762059700266910857880

[2,24,720,24024,570050,12702057,298167456,
 7208117568,173161739904,4127570837184,
 98339773309856,2347000930925753,56041331020681154,
 1337774984135116376,31928671287098350544,
 762059700266910857880]