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A235518 as a simple table

na(n)
1256
22272
320164
4131208
5853776
64548852
724235929
8112067172
9518199696
102154384960
118956729600
1234271036800
13131130894400
14469396239400
151680251100025
165694507984600
1719299151886400
1862486124366960

[256,2272,20164,131208,853776,4548852,24235929,
 112067172,518199696,2154384960,8956729600,
 34271036800,131130894400,469396239400,
 1680251100025,5694507984600,19299151886400,
 62486124366960]