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A046999 as a simple table

na(n)
128
2496
38128
4950976
52178540
633550336
7142990848
8301953024
9459818240
10675347400
11714954240
12995248800
131379454720
142701389600
153288789504
166720569856
178589869056
1810200236032
1914254365440
2030600708096
2142763096320
2243861478400
2366433720320
2471271827200

[28,496,8128,950976,2178540,33550336,142990848,
 301953024,459818240,675347400,714954240,995248800,
 1379454720,2701389600,3288789504,6720569856,
 8589869056,10200236032,14254365440,30600708096,
 42763096320,43861478400,66433720320,71271827200]