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A181588 as a simple table

na(n)
01
11
21
33
428
5658
636336
74918960
81913308480
92722820397008
1016147361055588096
11383879833447290828032
1234790330152647391683716096
1311818617432918372433417869737472

[1,1,1,3,28,658,36336,4918960,1913308480,
 2722820397008,16147361055588096,
 383879833447290828032,34790330152647391683716096,
 11818617432918372433417869737472]