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A180880 as a simple table

na(n)
16
250
3360
41960
510010
645738
7203616
8854700
93560172
1014299428
1157595824
12226022940
13895687650
143473777450
1513672916400
1652745436172
17207268333844
18798176908620
193139574496240
2012092845015888
2147667323303236

[6,50,360,1960,10010,45738,203616,854700,3560172,
 14299428,57595824,226022940,895687650,3473777450,
 13672916400,52745436172,207268333844,798176908620,
 3139574496240,12092845015888,47667323303236]