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A189907 as a simple table

na(n)
128
2784
321952
4377517
56442436
6109264923
71841998924
830880712109
9513953862828
108524935994485
11141100741163866
122331559436006836
1338495167111404534
14635205147205219239
1510477659617370128080

[28,784,21952,377517,6442436,109264923,1841998924,
 30880712109,513953862828,8524935994485,
 141100741163866,2331559436006836,
 38495167111404534,635205147205219239,
 10477659617370128080]