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A260949 as a simple table

na(n)
01
14
216
376
4416
52576
617840
7137268
81170104
911050940
10115885968
111353366864
1217640817784
13256630492660
144153220868128
1574315436120300
161458541231513152
1731131651836906752
18716862465409883040
1917683184383300077828
20464519709712796199816

[1,4,16,76,416,2576,17840,137268,1170104,11050940,
 115885968,1353366864,17640817784,256630492660,
 4153220868128,74315436120300,1458541231513152,
 31131651836906752,716862465409883040,
 17683184383300077828,464519709712796199816]