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A001879 as a simple table

na(n)
01
16
245
3420
44725
562370
6945945
716216200
8310134825
96547290750
10151242416325
113794809718700
12102776096548125
132988412653476250
1492854250304440625
153070380543400170000
16107655217802968460625
173989575718580595893750
18155815096120119939628125

[1,6,45,420,4725,62370,945945,16216200,310134825,
 6547290750,151242416325,3794809718700,
 102776096548125,2988412653476250,
 92854250304440625,3070380543400170000,
 107655217802968460625,3989575718580595893750,
 155815096120119939628125]